Call of Duty 2. Not because the game is shit, far from it, I can see that it's good - however, by the time I had a comp that could actually run the game, I was already used to Red Orchestra and CoD2 just didn't cut it for me. Sad but true.
Call of Duty: World at War. Played it a little at a friend's house, didn't like it, not even gonna bother torrenting it.
Unreal Tournament III. Played it at the same friend's house, don't like the visual style, and the completely ridiculous single-player campaign placed this game firmly in my "ignore" category.
Far Cry. @%#^%^@#%@^*!@(%!*%@#%@#% pseudoboss sequences. I hate helicopters and artillery boats with a fierce, burning passion. (Though I guess this reflects more on my skills than on the game itself.)
Company of Heroes. Again, I recognise it's a good game, but like with CoD2 and Red Orchestra, I'd gotten used to the Codename

anzers games, and CoH just felt too game-y and dumbed down, despite some awesome features I'll stick with the Panzers games.
Ess Tee Ay Ell Kay Ee Arr: Walking long distances only to have my allies storm in like lobotomised sheep and get slaughtered, leaving me to clear out an entire farm with a pistol? Riiight. (Same basic principle as Far Cry really, only with added long, boring treks.)
Empire Earth 2. How can they make a sequel look less attractive and more confusing? Besides, with all the added stuff like territories and suchlike, it's more like Rise of Nations 2, and I might have been more positive about it. Not much, but still.
Ground Control 2. Ground Control 1 is bloody awesome, the sequel killed it. The squad system was removed, the entire visual style was different, you were no longer an omnipotent commander leading a massive-scale battle, you were any other dime-a-dozen douchebag controlling sixteen-odd units. The game was turned from an appealing sci-fi RTS to a dumbed-down bog-standard by-the-numbers RTS.
The Settlers: Heritage of Kings. How can this utter crap be called Settlers? It isn't even
remotely similar to
any of the previous four games. It's a genericised medieval RTS, and while it has some nice points, again the sheer nerve of calling it The Settlers completely kills it. Also, the story was lame at best, the design was below lame at best (I mean, evil guys in spiky black armour with equally spiky battle-axes? C'mon.....), and the writing and voice acting were just
atrocious. After the mission with the snivelling bishop and the painful-to-listen-to alliterating noble or whatever, I had had more than enough, deinstalled it and never looked back.
Dawn of War: Soulstorm. At least until they FINALLY fix that god-awful memory leak and the game
doesn't take something on the order of six minutes to load. (By contrast, the other DoW games all load within
seconds.)