They were noticeably better with Barkley
It's just frustrating because Allen has excellent arm strength, he's good at scrambling out of the pocket, he's as unsackable as a QB can be and he can pick up lots of yards with his feet. His problems all seem to stem from either inexperience, overconfidence or a tendency to make bad decisions, particularly with him regularly resorting to hero ball.
E: oh, and his accuracy seems to be an issue, too. He's like the anti-Brady