I'm reading this and shaking my head:
It should be crystal clear that Mac is a skittish, gutless QB, afraid to take a hit, turnover prone, horrible form, throws off his back foot, a guy who the other players HAVE NO FAITH in.
When you compare him to other QBs and say they would be equally bad here playing behind our OL (even though some of the people mentioned have much much much worse OLs) and with a less than stellar WR group (understood); you're ignoring the fact that there are many middling QBs in this league who are not afraid to step into the pocket, not afraid to step into the throw, QBs who aren't reckless with the ball, etc.
To say MANY other QBs also wouldn't have a chance with this team is totally not true, and it's a sure sign you are underrating how bad Mac is.
Remember Scott Secules? Tommy Hodson? I thought I'd forgotten them. But now I remember them.