Compton's England career was bizarre. Got a bunch of starts without kicking on in India, then a couple of centuries in New Zealand, before a bunch of failures at home to New Zealand. Not like he's kicking the door down in first class cricket though, his record since being dropped is no more than okay, and (like Hales tbf) the bulk of his runs have come at no.3.
Not just cricket with Compton though. There are rumours that he's difficult to work with and didn't fit with the 'culture' of the side, which we were very keen on banging on about in any KP discussion. There's also a story that in one test he was injured and said he couldn't field but scans showed very minimal damage which pissed off the coaches. I obviously don't know the full facts though.
With hindsight it seems we should have stuck with him a bit longer though. Same goes for Carberry, who actually had harsher treatment imo. He had an alright record against some of the best bowling I've seen in 'Johnson's Ashes', and then got discarded without a clear explanation.