Fighting one tough opponent is no problem. Dodge, attack, dodge, etc. The "automatic aiming" ensures I will always hit when in range. But how are you supposed to fight multiple opponents, surrounding you, striking you from behind?
In other games like Darksiders or Assassin's Creed, you can just press a direction and the protagonist will lash out in that direction. This way you can always attack the enemy who poses the greatest threat.
But in The Witcher 2, you can only ever attack the opponent currently selected, and even when performing a slow attack, wielding the long sword in a wide arc, only the selected opponent will be hit. Sure you can turn the camera to have the game select another foe, but it's extremely "sticky". (I'm playing with Mouse+Keyboard. I also have an Xbox 360 gamepad)
Currently, I run around in circles, wait for the monsters to line up, hit the first one a couple of times, and then run like hell. It's neither fun nor does it feel very heroic.
For instance: How did you fight off the Scoia'Tel that attack while Triss casts her force field (at the beginning)? I don't think I killed a single one of those elves. I was just running/dodging around Triss until we arrived at the village.