The problem for Leban & Swick is that they were on TUF (I think all other TUF fighters are gonna find this also). Because of the format of the show people assume that they got in the UFC on a golden ticket & didn't earn their way their say like Vera or Anderson Silva.
If they didn't go on TUF but were just entered on the low end of the bill on UFC cards I'd doubt many would call then overrated.
But getting back to topic, I think the most over-rated in the UFC is Frank Mir. He's good, but is he as good as most people say he is....not by a long way.