1. ) OFP: Dragon Rising - laughed out loud after 4th mission of the same boring crap and uninstalled.
2.) Far Cry 2. Don't know why I couldn't get into it, but it bored me and I never got far.
3.) All Brothers in Arms games. Once you've played COD, this just doesn't cut it.
4.) Borderlands. Pile of crap in my opinion. Weird movement and enemies AI code couldn't stretch much further than 12 lines of code.
5.) Fallout 3 . Oblivion with guns. Tried liking it and know there had to be a good story there, but it just didn't interested me enough to look for it. I tried. Wouldn't say it was one of the worse games I've ever played, I just feel indiferent to it and don't care about it at all.