Cena uses the same 5 moves, in a similar pattern, to beat everyone. And hardly ever sells something - there have been occasions where he's "relentlessly" attacked by a guy with a chair, until he's beaten down and all the kids are crying. Then by the time the camera has followed the chair guy out of the ring, Cena is standing up in the middle of the ring screaming
When Cena first came he had the gimmick of "ruthless aggression" and actually wrestled a bit. The white rapper gimmick wasnt too bad either. But then they changed it to him being some kind of U.S army guy and since then he just tries to be funny and "never give up". Despite being the most popular face around, in pretty much every match there will be chants of Cena sucks. He also used to have a good name, "Prototype" but they got rid of that when they called him up to the wwe
When Cena had funny gear, and when the wwe should have signed Danielson