You've got to take into account that the UFC is sort of going through an expansion stage of sorts. The more MMA's that are given a chance to show their skill, the more waterdown and diluted the talent pool will seem.
Think of it terms of other professional sports. Drafts happen once a year and probably once every 5 years is there a guy who gets drafted and its like "wow, he could be MVP soon".
Same with this. Alot of these guys are projects. We were spoiled in early seasons, with Diego's, Koscheck's, Forrest Griffin's, Joe Daddy's and KenFlo's...
At that time, they assembled who they believed to be the best guys not in the org at the time. That was 10 seasons ago. And with MMA being a sport that requires so many difference facets to be successful at the highest level, it's not like football or baseball, where if a guy can only pitch really well or be a return specialist, he can make it to the pro level with that.
Here, guys have to be all-around or they just look inferior when they make it to UFN's or PPV's.