I'm not going to say you're trolling, but you're awfully opinionated about something you seem to know very little about. Aside from FPS games, there have been MMORPGs, 3rd Person Action, heck, even a pinball game on the various generations of the engine. The modding community of UT2k4 even has Total Conversions that alter it to a racing game, platformer, or even RTS. There have also been numerous succesful attempts at integrating RPG features.