Yeah I guess we have different definitions of "most overrated." I would definitely agree that he has under performed, especially in the last 2 years, but the guy has been 1 score away from a probable playoff birth 3 out of the last 6 years. Is he overpaid, probably but proven coaches are incredibly in demand and a program like PSU isn't going to make any move until they already have another proven winner lined up.
I also get that the expectations at PSU are different, a lot like the Steelers. When Tomlin wins the division but loses in the 1st playoff game he definitely under performed, but that doesn't mean he's the most overrated coach that season.
I just think it's a bit of a reach by a MSU alumnus and a bunch of Pitt fans to claim he's the most overrated in college football. One even going as far to say that he ruined a Vanderbilt program that could count their winning seasons in the 50 years before his arrival on 1 hand with a thumb left over.