1. John Cena
Hands down, the guy is the back bone of the company. Has been for years, and will be for years to come.
2. CM Punk
The only guy on the roster that can go toe to toe with Cena. In terms of work rate, selling, and popularity.
3. Randy Orton
He's practically been at the top of the roster since his debut. He hasn't done anything of note in years, yet still draws positive reactions, and sells nicely. A heel turn in the future could boost his career again
4. Daniel Bryan
May seem like a weird choice, but I don't think anyone on the roster right now has a bigger connection with the fans then he does. He can just take over a crowd and have them eating out of his hand the moment he walks out. For not being in the WWE for very long, he has already made a huge impact. Always is solid in the ring, as well.
5. Dolph Ziggler
This one could have gone to two other people, those being Ryback and Sheamus, I feel as though, whatever Ziggler does, heel or face, the fans always back him. He always gets a very loud pop, even for being a heel, and I can't even name one bad match of his. He just started his world title reign, and hopefully he doesn't go the Miz route, but ends up becoming a main event stayer, a top guy, if not the face of Smackdown.