I'll build the case against Clawson, even though I think he's doing fine enough and would give him four years (as I said earlier in this thread):
At the FBS level, Clawson has proven to be a really poor offensive coach. His one year at Tennessee is basically the worst offense any strong national program has produced in the past decade (FEI offense 96/120). At Bowling Green, they were decent at offense year 1 running spread with inherited personnel. Starting year 2 they implimented the normal Clawfense as the rebuild started. In the 4 years in Clawson's scheme BGSU ranked FEI offense 108/120, 83/120, 102/124, 44/125.
44/125 at BGSU is good, and this season and MAC title is what got Clawson hired. However, BGSU was top five in the country at 3rd and 5+ conversions in 2013. Which is a very tough thing to replicate and count on to generate good offense year after year. Matt Johnson was/is a really special QB (he has 3300 yards, 29 TDs, 3 INTs this year so far).
Now at WFU the personnel has been horrible but the offensive schemes also seem horrible. I do think strong offense coaches can scheme their way with horrible personnel to better results than we have seen in 19 games. So I don't think BDL, others that aren't too high on Clawson are out of bounds with their viewpoint. I think there are some major concerns that Clawson will be able to put top 50 offenses on the field at Wake Forest.