The criteria according to UFC.com:

First is level of success. Winning a UFC championship is the obvious pinnacle, and only three TUF competitors (Matt Serra, Forrest Griffin, and Rashad Evans) have reached those heights. Fighting for a UFC belt is big plus in a fighter’s favor as well. Next up is quality of opposition. Fighting at the highest level of the game and losing a few fights will get you more points here than winning a bunch of fights at the prelim level. And finally, we’re looking at impact on the organization, which is a subjective call, but one that is necessary. Headlining pay-per-views and being in the public eye consistently adds a level of pressure fighting in non-televised bouts just doesn’t have. That’s why a Michael Bisping, who has been the face of UK MMA and the headliner or participant in a featured bout on many major cards, is in the top five while other veteran performers are below him.

Personally, I think Bader and Sodollah should be on the list...drop Mitrione and maybe Grove. Also put Koscheck higher than Sotiropolous and move Roy higher than Schaub...much better.