I couldn't stand the combat to begin with either (postponed playing the game for probably 2 years due to it), but once I settled for the utter (absurd) need to roll around a great, great deal, it become more fun. Some boss fights are unfortunately still utter BS, but most of the combat in the game becomes bearable once you get more used to it. I agree the system in TW1 was better. More in line with what an actual witcher would do, more realistic if you will.
There is lots of story to delve into, however, so hopefully you can manage with the combat and still enjoy the game.
Unfortunately the UI is a nightmare compared with TW1, clearly made with consoles in mind, but it is what it is, and overall the game is worth playing through. I'd recommend some minor mods to reduce the weight of most items, however, as you'll come across piles of items and monster parts, and having to leave the majority behind is not a great feeling if you are like most RPG players :D