If you've only played 30 minutes of the Witcher, then its far too early to have an opinion of it. The first 2 hours are just the introduction, bread-crumbing you through the various aspects of play. Once you leave the coven area or whatever it was called, then the real game starts. The tactical aspect of the combat actually lies in three things: The first is the chaining, as you mentioned. The second is choosing the stance that you use during a battle, which is imperative. The last is the most important, which actually takes place before entering combat. That is using the right potions for the job. Alchemy is a huge part of the game, and the potions have more of an effect on gameplay than in most other games, rather than being tacked-on. The simple act of drinking a strength potion, (I think its called a Lion potion, I can't remember,) can make all the difference. I like having to prepare, and think things out before acting. This is something that I was expecting in DA2, but it didn't occur. I'm hoping the Witcher 2 maintains this, while adding more to the mix.
So yeah, I'm really excited for this. I've been pumped for a while.