The other thing people don't talk about much is not only the little (but important!) things like flyJSH (Capt. Jack) mentions is the ability or inability to communicate will with ATC. We operate in the NYC area alot and it is busy busy busy! Some of the new folks do have a learning curve when it comes to that stuff. If you just got your CFI at Joe's FBO out in the country it'll take a little while to get up to speed.
Anyway, everyone's been a newby at one point.