Grossman vs Brees?

Lately the media and announcers have been bashing Grossman. I agree Grossman has been pretty horrible. HOW come these same announcers and media types aren't calling for Brees to be replaced? I was appauled during the Bears vs Cowboys game, when one announcer even went so far as to blame Grossman for getting sacked. Which I found to be one of the most insanely stupid comments ever made. IF people are calling for Griese to replace Grossman.. how come nobody is clammering for Brees to get replaced. The Bears have one more win than the Saints do. Both QB's stats are pretty much even. I just don't get it? IF you scrutinize one guy that harshly you had better scrutinize all of them that harshly.