No way. Cowboys fans are uniquely entitled. We've got a big bandwagon, which necessarily means they've got a higher percentage of casual fans relative to most other teams. We're also from Texas, where everybody was a high school football star, and I think they have a higher number of die-hard fans who'd rather be right than supportive as a result. The team's popularity also attracts trolls to the board, some of whom disguise themselves as fans.
I can't speak for everybody, but I think we've got some of the best, and many of the worst fans in the league as a result. That said, I've never seen a place where fans are as apt to jump ship on a star player for so little reason. Just look how much chance RW11 got if you need an example. And if you want to take the next step and attribute that to quality of play last year, then explain why players like Bradie James and Tony Romo get so much heat? It's just bizarre.