Mediocre record? He lost to the 1, 2 and 3 ranked guys in the UFC LHW division and there are plenty that believed he beat Jones. Plus he came very close to beating DC. In fact it was DC's toughest fight outside of Jones. The loss to Rumble, well that could happen to anyone.
If he were to rematch with any of the 3, he has a decent chance of winning.
His loss to Phil Davis back in 2010 is no shame either. Davis has been a top 5 LHW forever.
Almost beating the greatest LHW of all time and going to a damn close split decision against Cormier, arguably the second best LHW of all time is not a negative on his resume.