I like to play everything, but as with food, I don't like to partake of the same thing for too long. I believe that within a single campaign, its possible to mix and match periods of exploration, detective work, drama, tactical combat, and so forth to create a hopefully harmonious whole experience. At least, I've had that experience playing and hope to provide that experience when I run a game.
There are limits to my ability as a game master though. I can't run a humorous game. My attempts invariably turn dark and serious. Ever played Paranoia as a straight up dark dysotopian sci-fi? Wasn't my intention, but that's where it ended up. I'm afraid I get creepy and scary alot better than I get funny. If I did an RPG based on 'Red Dwarf' it would probably end up a nightmarish exploration of the horrors of isolation and lonliness, complete with regular sanity checks and interludes of terrifying halucinations. My 'Squirrel Attack' would probably end up as a feral gorey splatterfest red in tooth and claw. I probably should not be let anywhere near the 'My Life With Master' rules. I'm just not good at being intentionally funny.