The Witcher 2 is actually nothing like that. It is actually somewhat like Oblivion in that it has a minimap with an arrow pointing you toward the quest objective. It is FAR more polished than the original, and is probably the best presentation of a story I have ever seen in an RPG (I consider it better than Mass Effect 1 and 2 in that regard, but those have very good presentation as well). I actually enjoy the combat, although it is much more difficult than the Witcher 1 (You could kill 99% of the enemies in TW1 simply by casting Aard to knock him down, then perform a finishing move while he was on the ground. Not so in TW2).
The side quests in the Witcher 2 are far better and more polished, which really helps the game. But the game is very linear (although it has a lot of branches, that make the game completely different depending on the choices you make) and it isn't one where you can just go do whatever you want like in an Elder Scrolls game.