As much as I enjoyed Witcher 2, I feel the first game is much better as an RPG. The atmosphere and the story are much better. Combat is very confusing at first; I didn't get the timing concept right away, but it clicks in and works well enough. Once you start mastering more abilities, it becomes more fun. There is a larger bestiary in W1. Potion crafting and usage is superior in the first game, as well as inventory management, and the journal. Pretty much everything in the menu system is better in the first game. Also, bar fights reduced to QTEs in the second game was very disappointing. Both games look outstanding in Nvidia 3D Vision. And it's like Pokemon trying to collect all the fuck cards!
The only mod I used is the scabbard mod.
I'm really looking forward to The Witcher 3.