Easily Two Worlds. The entire game was a mess. Luckily, Two Worlds II looks extremely solid so far.
My Favorite RPGs: Divinity franchise, Gothic franchise (including Arcania, so I think I'm alone...), Venetica, Risen, Two Worlds II, The Witcher, Sacred franchise, Fallout franchise, Mass Effect 1, Alpha Protocol, Planescape: Torment, Drakensang, KOTOR 1 & 2, etc.
