Cena doesn't get enough credit. Sure, the booking makes him boring or easy to resent, but that doesn't reflect on his tools. He does damn fine in spite of this, and he is extraordinarily talented. I think people don't like the kind of work he does, and don't give him a fair shake when it comes to the work he can do.
I have no doubt he could perform in a heel role on the level of Orton and Edge, and when not limited, can work a damn fine match/promo.

But I do have to answer Edge. Just giving some credit where it is due

Edge