I wouldn't call it a diss rather then an honest opinion. The guy has pratically been given his career to him since his debut. He had feuds with the likes of Batista, Undertaker and Kane (I think) before he even got his feet wet in the WWE. Was gaven the US title on a silver platter which did nothing for him.
He then must of been deemed to big for the US title because he lost it a month later. Then continued on with high profile feuds before winning MITB.
But all that got derailed by an injury and Kennedy hasn't been the same since he's been better. He's not as green, has a moveset and he can somewhat work a match and wow-he actually has a finisher that's lasted more then two weeks!
Kennedy needed that derailment to get him off the main event scene so when he is ready to come in it (not yet, he's still too green but they seem to be preparing him for the future.) He can make an actual impact in the main event scene. He doesn't seem to be slowing down with the high profile feuds though which i hope means only the positive for his career. Before his main event push he should actually win a feud descisevly, which he will do one of these days.