There are definitely two major factions within the fanbase:
#1 - These are the guys for whom, after a loss, nothing is out of bounds. Fire Ferentz, fire O'Keefe, burn down Kinnick, etc...
#2 - These are the guys for whom, after a win, everything is beyond criticism. We could give up 600 yards but win 47-45...when something is posted about the defense, this factions posts about our overall record and how "we know how to get a win."
I happily reside between these two factions somewhere. It's easiest to point out flaws after a loss, but there are always areas of improvement, even after a 31 point win over a top 5 team. There's just harder to see...
My $0.02.