Great as in Brady/Manning/Brees? Nope. He is very good, much better than Rodgers so far in close games. His record this season itself proves that. But yeah, he has lot of room to grow.
Rodgers does have way better weapons than Ryan though. Heck if everyone is healthy, Rodgers probably overall has the best weapons in NFL on the whole. I.e. TEs and 4-5 deep at WR, and very good RB and decent enough OL, when Rodgers doesn't hold the ball too long. Heck his D is ready for SB. Ryan's is not.
Anyway, in close games, Ryan's record so far is attrocious and he also has been starting for 3 years like Rodgers, but has been starter since day one unlike Rodgers.
Anyway, people some reason fall in love with his FFL stats and don't look at his game closely. Thats always been my beef. I used to dislike Rivers, but after watching his game enough, have to give him respect and put in almost elite category now. Plus he has won enough Playoff games, on the road and at home. I personally I always expect Rodgers not to win if he has get a TD to win the game. Much like the same way I have always felt with McNabb.