Unusually for bleacher report they have done a very detailed article on Andy and where he needs to improve, well worth a read:
some of the more obvious statements:
"Dalton doesn't look like a quarterback who could carry an offense on his back for 16 games of the season, but he is also not dragging the Bengals to the depths of the AFC North.
Dalton falls somewhere between the below-average to above-average range of signal-callers in the NFL. From person to person, players in that range are almost interchangeable because of the variables that come with evaluating the individual performance."
"If the Bengals are to go deeper in their journey toward that elusive Super Bowl title, they will need their young quarterback to develop more from season two to season three than he did from season one to season two."