I think its a combination of his promo work being basically the same thing over and over and over again and his matches. There's only so many times you can listen to someone spout off about how they won't quit, blah, blah, blah. Add in to it his matches are very repetitive as well, and there's your answer. Personally, i enjoyed his character when he was in his rapper\thug days. He was edgy and his one liners were funny. However, he has been toned down tremendously in order to fit into the pg era, appealing more to little kids and their parents. That's not his fault really. I appreciate the effort cena gives and think if he was more like his original thug character it would be ok. I don't hate the guy like many of the posters here seem to. It's the cool thing in the iwc to bash cena. Hence, theres threads like this one. He just needs to be freshened up a bit and it won't be so bland. Also, i don't think the majority of wwe fans find him stale, or he wouldn't sell the merchandise he does. But yeah, repetiveness and no real change in his character the past four years will make anyone stale.