DelnarErsike: There are a lot things that need to be changed or tweaked in TW2 (especially the tutorial, which is pretty much non-existant, TW1's was much better because it had certain points in it specifically made to teach you how to use signs, how to drink potions, how make potions, etc.), but the main one IMO is combat. It's a really bad sign if I enjoyed the combat system of TW1 more than that of TW2...
After a bit of analyzing the mechanics of combat, I think the three main problems are the inability to cancel actions in-flight, the lack of control over Geralt's attacks, and the lack of proper crowd control.
The first problem is basically this: you see three enemies standing next to each other, none of them are attacking, so you decide to attack the one on the left. As Geralt's leaping at the enemy, you see the one in the middle starting to attack; you want to roll out of the way, but the game doesn't let you, forcing Geralt's animation to complete before allowing you to take any other action. This becomes exponentially frustrating the more enemies you have to fight at once, especially when Geralt flinches from a blow (those 0.5 seconds of extra, uncancelable animation can be very important in a fight).
The second problem's explanation: when you see an enemy and press LMB to quick attack, you don't specifically know whether Geralt will jump at the enemy or just swing his sword at nothing in the general direction of the enemy. I've had plenty of fights where I've died because I thought I would jump at the enemy, therefore out of the reach of four other enemies, but Geralt just lunged forward a bit, allowing the other four to land a total of six blows (two landed, then the second two landed because of knockback, then the third two landed because of knockback caused by attacks landed because of the first knockback).
The third problem: in TW1, Aard and Igni both affected an entire area, while Group style existed to dispatch large groups of enemies. Bombs and Yrden joined the toolset for countering groups later on, as well as improvements to the existing three tools. In TW2, the only tools you have against a group of two or more enemies are Yrden, which early into the game becomes useless if there are more than three enemies, and bombs. The over-reliance on bombs means you'll never have enough of them, even if you keep crafting them. If I'm forced to Igni-kite whenever I'm in combat vs. 12 nekkers in a claustrophibic cave environment, or forced to exploit AI bugs to make sure I'm only ever fighting a maximum of two enemies at once, I'm not having fun, and I'm definitely not enjoying the game.
and then there are the times that you get pushed up against a wall, with 3+ enemies around you making it impossible to move at all. you re Geralt is a pin cushion at that moment you can get out of it but your not getting out with high health