I don't agree, I feel combat in Gothic is more interactive and more fun in the long run, but the learning curve might be a bit too steep. What gameplay style people prefer is a matter of taste though.
I read an interview recently that the atmosphere is, indeed, partially inspired by Gothic, and that is definetly something you notice. The Witcher is the only 3D game, except G1-2, I've ever played that manages to create a good, realistic atmosphere. It feels great.
The main city in The Witcher is bigger than any of those in Gothic, but divided into zones that require loading inbetween. Even though it feels great, due to the fact that it's divided, and the fact that you need to load every time you enter/exit a house, you don't get the same feeling of the city being "whole". That is a unique feeling that I've only really encountered in Gothic. The NPCs are usually very interesting though, and you meet more than enough interesting characters along the way.
Basically, if you're looking for Gothic style exploration and combat, The Witcher might not be the ideal game. However, if you're looking for a game with a similar atmosphere, a dark world, and a great story, The Witcher is definetly for you! I personally love the Gothic games, I consider 1-2 (w/NotR) to be among the best games I've ever played, and I feel The Witcher, along with NWN2/MotB, are the best games I've played since NotR came out.
I'm looking forward to an add-on or sequal already, if they ever make one. I feel the world in The Witcher has much to offer, so it would be fun to explolre it even more.
Edit: Oh, and welcome to the forums!