Already finished: http://www.gog.com/en/forum/general/games_finished_in_2012_1/post566
Leave Home - A Xbox 360 indie shoot'em up. Some random levels and whatnot, nothing special
Warhammer 40,000: Space Marine - I know some people like this, but I thought it was rubbish. Horrible boring and buggy game.
Tropico 3 - Finally done with all the 15 campaign missions. Really awesome game, although there is not really much difference in the end between the missions. Once you understand all the buildings it is easy to win. Hardest one was no doubt to get happiness to 65%. Really easy to get it up there when you are not trying. :) Got also the Absolute Power DLC already, but not too interested in playing it. Especially because the new buildings from it are already available in the main game.