A couple of things:
There are two Drakensang games out now, but I don't know if the second one is available in English yet (the original games are in German). The first one is called Drakensang, the second is called Drakensang: The River of Time. There's a thread where I wrote a bit about my experiences with the first game. The second was very similar if I remember correctly, but I don't remember much, although it came out only a couple of months ago (and I have a very good memory!). It was just too bland, I can't even tell you what it was about, that's how unimpressive the story was. They are ok games to pass the time, but there are better ones out there. I think you might be disappointed by the lack of banters.
2) The Witcher:
I love the Witcher. The game has its flaws, yes, but I enjoyed it more than e.g. Dragon Age. I read the first book in English and found that the translation sucked so much I didn't know what I was reading about, but the German translation is ok and there are more books available. I very much like fixed characters in general and Geralt in particular. He's badass and it's a joy to play as him.
I think the Witcher is somewhat darker, grittier and moodier, sort of what Dragon Age wants to be when it grows up. It's a violent, rude and dirty world; in comparison, Dragon Age looked like Disneyland to me. The sex card collecting isn't obligatory as far as I know, just a bit of silly pastime. The are lots of more "mature" aspects to the game. It's all about choices. The game is linear and your choices don't change the plot very much, true, but they still come back to haunt you, often when you least expect it.
You're on your own for most of the game, but there are a couple of NPCs you see more often and who have really grown on me, like Siegfried. But overall, there is too little dialogue for my taste.
The main flaw of the game is the fighting. I had a tough time killing that one fire dog thing right at the start of the game, but turns out that was the most difficult fight of the game and it all just got easy-peasy from there. And tedious. It's a lot of hacking and slashing with very little variety.
As I said, I love the Witcher and I'm looking forward to the second one. I think it's mainly because I like Geralt and the whole gritty setting so much. From what I've read, I don't think you'd enjoy it.
3) Fixed characters in general:
I'm suprised that so many people don't like fixed characters. I think a fixed character is a virtue, not a flaw, and so much nicer than generic no-name PCs. If PCs have a fixed gender, look, voice and (to some extent) personality, they feel so much more alive, I think. They usually have a much better graphic design; I'd much rather play as a butt-ugly, but memorable dude than one of those interchangeable, faceless glossy magazine models. If PCs are voiced, they don't have to stand around dumbfounded while the other characters deliver gorgeous lines. And the surroundings can react so much more to them.
As much as I like BG, I don't like how the PC is soulless (in more than one sense). I'd prefer it if games could take into account all aspects of the PC, gender, looks, dislikes, quirks, class, race, etc., and that is a lot easier if the main aspects of the PC are fixed to begin with. I want to see all this in the game, not imagine it in my head. I'm not saying it's impossible to have a memorable entirely player-generated PC, but it seems much more work than developers are willing to do.
The original game is boring as hell, but there are fantastic mods out there! My favourite is A Dance with Rogues Part 1 and Part 2. I think it beats many (all?) professionally made games by far - and all that written and coded by one single person! I think it has much more content than most professional games nowadays, has an interesting main storyline and loads and loads of side quests. It takes forever to play the whole thing. In the first few hours/chapters you can pretty much do anything you want and roam the town and parts of the countryside. Later the plot becomes quite linear, but it's all very carefully designed and never gets boring.
I don't want to give too much away about the plot, you just have to see it for yourself, but let me tell you, it has lots of twists! Just a couple of things: The PC is somewhat fixed; you have to play a human woman (a princess) and I think you also have to have basic thief skills (there are some main quests where you need to sneak and open locks and stuff), but it makes perfect sense storywise. Other than that you're pretty free to do what you want and can e.g. level up as a cleric, too, you can choose her looks (not that it matters, NWN looks ugly either way) and name.
You play the princess of a kingdom which is taken over by its hostile neighbour. Everything she knew is destroyed, everyone's dead but her. She escapes and lives with a thief guild. That's where the fun part starts! You can determine how your princess behaves; she can stay a virtuous princess or become a harbour whore, be prissy or strong, nice or bitchy, whatever you want.
In the beginning of Part 1, you are on your own without a party for quite some time, but it makes perfect sense and you will still see a lot of dialogue and meet a lot of people. You'll get to meet NPCs who will stay with you (or not) eventually, and they will banter with you and with each other. A lot. The NPCs all have unique personalities, some like and some hate each other, some are nice, some are very, very rude.
The princess can romance the joinable NPCs and sleep with, uhm, almost everybody, joinables, non-joinables, men, women, young people, old people, humans, elves, dwarves, animals (oops)... There is loads of sex, nudity, swearing, crime, torture, rape, killing, and general violence in this game. The sex is sometimes romantic, often weird, brutal and nauseating, mostly offensive and always overly detailed, graphic and campy. I love it. It might not be for the faint of heart, but I heard you can skip almost all of it if you don't like it. I wouldn't, because it's a huge part of what makes the game so fantastic. The game is just so daring and racy and addresses almost every possible and impossible aspect of life.
The plot is very exciting! There are many quests which can be solved in different ways, you can be sneaky, kill everything in sight, trade sex for what you want, talk yourself out of it, whatever you fancy. Note that you will be very weak in the beginning though, and probably won't be able to fight at all, but that is why it's so fun and exciting! You have to be on your guard constantly; after all, the city is full of hostile soldiers looking for the princess. In general, the quests are very versatile, not just FedEx quests and battles, but lots of different ideas and always interesting.
The game has great replay value. There are a couple of choices you have to make that will somewhat influence the outcome of the plot later. I played it a couple of times and haven't yet seen all the outcomes! Also, the author, Valine, has changed large chunks of the game over the years, I think mostly adding to it, not taking from it, but always changing it and always for the better, I think. Sadly, the older versions aren't openly available; I found it very interesting to compare the older version I played first to the latest one. Last thing I heard was that she was planning a major overhaul of Part 2 to make more sense of the stuff she added to Part 1. I'm very much looking forward to it!
I could imagine some people might not like the writing very much, it's often vulgar and crude and not the best style, but it's part of the charm. I just can't praise this mod enough!