Well his star d linemen blew off his hand. His secondary's riddled with injuries. His offense, though, is having an inexplicably great year despite some maturity issues.
I'd say that paired with the fact that he's brought them 2 superbowls, Coughlin should be given at least another year.
If the Giants had a healthy defense they'd have 8-9 wins right now and be in the picture still.