He is a system QB and he is one of the weakest QB's under pressure. However, I think people underestimate that it is hard to find a system QB and there's good value to a QB that can connect on easier throws or throws where he has more time.
RG3 would stink with the same talent around him because he doesn't have the footwork for it.
The issue with a guy like Cousins is if a key piece goes missing, which tends to happen in the NFL with how high the injury rate is...he's more likely to look like a mediocre QB. Much more than the counterparts that are getting the same money Cousins is asking for.
This season he has a stout O-Line and then a receiving corp of DeSean Jackson, Pierre Garcon, Jamison Crowder, Vernon Davis and Jordan Reed. Crowder and Reed are excellent. Davis looks like he has plenty of tread on the tire and was once an elite TE not too long ago. Jackson is still an elite deep threat and Garcon is a sound Z-receiver. And while the play calling gets goofy at times, the play designs are really superb. It helps to have a QB like Cousins which allows you to run those play designs and get receivers wide open. But, if they aren't open and he's getting pressure, he's one of the worst performers versus pressure in the entire league.
He's an interesting case for sure. I would laugh if went elsewhere because I doubt the Skins will find a performer of his level at QB soon. But if he stays and signs a huge contract, I'll laugh because it doesn't take much for him turn into a lousy QB.
YR