Personally, all of the various promotions that separates the various fighters from competing with each other.
For me, in a perfect world, there would be an NFL-type league with a MMA commision to determine who gets title shots and what they get paid so it isn't so dictatorial.
I also hate when nobody is in attendence to watch the prelim fights. I dunno about anybody else, but I think that if you pay the money to go see the UFC and you actually enjoy MMA, you should attend to watch all the matches. This isn't like the opening act at a rock concert, these guys are putting it all out there.
MY MMA RANKINGS
HW Velasquez Cigano Werdum Cormier Bigfoot Barnett Mir Browne
LHW Jones Machida Evans Hendo Davis Goose Teixeira Shogun Mousasi Bader
MW ASilva Rockhold Belfort Weidman Jacare Okami Kennedy Consta Belcher Boetsch
WW GSP Hendricks Condit MacDonald Diaz Maia Fitch Kampmann Ellenberger Pyle
LW Bendo Alvarez Maynard Melendez Thomson J.Miller Diaz Pettis Chandler Grant dos Anjos
FW Aldo Mendes Curran Lamas Frankie Zombie
BW Cruz Barao Fernandes Faber Moraes