Vitek: My personal pick is
Universe at War for 90% off, 1.5€. I remember trying it back then and liking it and it's impossible to pass with this price.
EDIT: OK, after reading some reviews on GG it seems the game is GFWL, always had problems with it even in past and it was also abandoned by developer so it will probably stop working when GFWL goes boom, right? From what I could find from searching the net, the game seems to require validating your key with GFWL the first time it's run. Speculation seems to be that if you have done that, you'll be able to keep playing the (single player) game after GFWL goes down. But that's purely speculation and no one seems to really know for sure. The chances of this game getting GFWL patched out or converted completely to steam seem pretty unlikely, based on what I read in this thread: [url=]http://www.petroglyphgames.com/forums/index.php?/topic/15342-gfwl-question/[/url]
At this point, you really have to look at the offer as more of a rental. Would I pay $2 to rent a game 4-5 months? (GFWL is supposed to die in July, isn't it?) I'm not sure. I do know, if this a game you're buying for your backlog, it's best to pass. If this is a game you plan to play right now. Well, you may not get another chance at it in the future...