I'm guessing you mean current roster? because past wreslers has been done to death and the clear winnero f most over rated ever is Ric Flair.
Current roster, I go with the following in no particular order:
1> Ryback. being built as am monster, but everytime I see him I think of a Rhyno/RVD love child gone wrong? the only valid comparison to Goldberg is in his lack of ability.
5>Paul Heyman, he's shit on the mic, his voice makes me want to stab my eardrums and he's saying the same thins now as he did 10 years ago with no advancement of character. People rate him too highly from his days with ECW but I've never found anything he's said of done of any interest and every time he comes out I stop watching until I see he is gone.
Ok so Ric Flair... hands down is one of the best wrestlers to strap up boots and get into a wrestling ring, he can talk, he shows emotion in the ring and is one of the most decorated wrestlers of all time. I'm guessing you have never really looked much into his past to see all his accomplishments or even read about his prime, he was one of the main members of the legendary 4 horsemen, he helped jump start the career of both Batista and Randy Orton, not to mention some of the great clinics he put on in the ring with some very big names in the wrestling business where he outperformed them!
Ryback? how is he overrated? he is nothing as of right now. What everyone says about him is his potential in the future, he hasn't given us one feud yet, we haven't seen him really shine because he takes on jobbers. He could turn out to be a flop but he isn't in any position yet to be overrated when he really isn't in the main event
Paul Heyman is a better talker than 95% of the WWE talent right now, the only few people who may be better then him is Punk and Jericho in all honesty.. and Cena has his promos where he shows his great speaking ability. This guy is one of the most polarizing figured in wrestling with his charisma alone. All he has to do is sit in a ring and talk and he can make the whole arena hate him.. doesn't sound overrated to me