I just finished the game a few moments ago, and like some of the others here I'm a little disapointed with the ending, and I also wish I created a safe save at the start of chapter 3 so that I can go through the choices of chapter 3 again (in chapter 3 you get given lots of mutualy exclusive choices, save person A, or save person B. Let person C live or kill him/her etc...). I will proberly play through the game again at some point, playing a pure mage with a little alchemy on hard, and this time siding with Roche, although chapter 3 will still end up with me replaying that chapter several times just to see what happens if I let different people live/die.
As a mostly pure swordmanship witcher (with a few points in magic for quen III and tri-hit quen) I found the game got very easy in mid-late chapter 2 onwards, where I started to get some powerful weapons and with a longer lasting, more powerful, quen I could stay alive a LOT easier.
Also, I'm not sure if i missed it, but where can you get dragon scales? in chapter 3 I got the diagram of an amazing silver sword but one of the ingrediants (along with a ton of silver, iron and a few other common things) was dragon scales or skin or something, and to my knowledge I didn't fight a dragon up to that point, and the dragon near the end of the game you don't get items from and its too late to matter anyway.