Actually, Favre has made plenty of truly awful plays over his career. He's made some great ones as well.
As far as Anderson, I listened to Crennel talking about Anderson. Basically, the "hand off" to Suggs was a sloppy terrible play. But, there are a lot of other factors going on as well. The Browns receiving corps leads the league in drops, the running game hasn't been as effective, the defense isn't doing well. Crennel isn't a fan and he didn't lay all of the blame at the feet of Anderson. He said Anderson needed to play better, but wasn't doing badly either. Now the fans and media see the Golden Dome kid standing on the sideline, so their sights are leveled right at Anderson's chest and they're pulling the trigger after every mistake and every loss. Romeo decided to appeal to the mob, apparently. Unless the rest of the team suddenly starts playing better, it won't matter.