The national consensus on Losman is that he was drafted too high and that he should be farther along in his development. They compare him to Philip Rivers, Eli Manning and Ben Roethlisberger.
Rivers still has the book out on him, but he's looked very good so far.
Eli, though a bit inconsistent, clearly will be a great QB for many years.
All Ben did was win the superbowl.
So, that is what JP is being compared to. It's not difficult to see why they undervalue him in most of our opinions.
JP had played decently well up till the Bears game, but to get your panties up in a bunch because people don't think he is that good is a big thin skinned.
I for one hope that JP will pan out, I have seen many things to tell me he will. However, until he goes in and wins a game like last weekend, he's going to continue to be disrespected (and kind of rightly so).