We've all suffered through the "Boller/Wright/Banks/Grbac, etc." era. Let's not do that again.
I'm friends with a Packers fan. They say this same shit about Aaron Rodgers. This beef about Flacco is nothing new around the league.
Flacco has underperformed since that Super Bowl season, yes. But there are several mitigating factors, and when you've got a QB who's had winning seasons and his postseason track record and a magical Super Bowl run, he earns leeway for quite a few years -- just look at turnover-happy Brett Favre. The difference is, Favre's numbers would offset a lot of his criticism. Flacco's not Favre and will never be, but that's not what this team asks of him.
I'd rather watch our team keep every game close, than to watch them get their skulls beaten out every Sunday like the Browns, Jags, Niners, etc.