Right, games I have not finished but loved regardless... The list is way too long I suppose.
Many of the Bethesda games, but that's because I don't play them to be finished.
Expeditors: Conquisdator (spelling?), but that because I suck at turn-based strategy
Never finished any of the Total War games aside from a couple of campaigns, I'd recommend those to anyone - I just don't have the patience to pull trough them.
King Arthur: The Roleplaying Wargame - loved that one to death, same issue as with TW games
Deus Ex. Yes, I have never finished the original Deus Ex. I did get right to the end, just ... Kind of ... Stopped playing there tho.
Antimateria: In my opinion Witcher 1 is better in every sense, second one has too much political baffle. That combat.. how I could like witcher 2 combat because it was so small and linear so i did not even have a chance to understand that mechanics where you had to guess when to drink a potion..
Not entirely sure what you wanted to say by the second half of your post, but when it comes to me, I feel Witcher 2 was just way better than the original in every way imaginable. Since I loved politics of the books, I have absolutely adored what they did with them in the second game. And the non-linearity of the story, especially the second act, yummy...
monkeydelarge: I hate Mirror's Edge. Too much running away for my taste.
It's a game about running, what did you expect? :D