I myself wouldn't say that Cena is the hardest working mic and in ring worker. He does have a lot of matches and promos, but it's mostly just driven off the fans reactions or the opponent. One person who tries harder than Cena in all aspects in wrestling is MVP. While John Cena is making jokes with Grisham, MVP is over on Smackdown hyping up himself, and furthering his fued with Matt Hardy. While Cena is just looking for a pop or having the 'last word', MVP is over on Smackdown and casually talking and keeping the whole skit he's in exciting. Even in the ring MVP works harder than Cena. You have Cena almost doing the same thing every match and the same thing that he's been doing for the past 3 years (sure it gets a pop, but is that really because Cena's a hard worker?), then you have MVP over on Smackdown who continues to improve his game every single week, and his matches are far more deeper they were last year and half of this year. This is only one example. I know that Cena may get the bigger pops, and wrestles a lot, but IMO MVP is a much HARDER working wrestler than Cena.