First one that comes to my mind is Triple H. He's been overpushed due to his marriage with Stephanie McMahon and has main evented way more WrestleManias than several guys who were much bigger than him. And he's nearly always the second guy in feuds. Whenever he is feuding with someone with a lower star power than him the feud turns out to be underwhelming.
That isn't to say that Triple H lacks talent, but as far as the more well-known names go, he's probably the most overrated of the bunch. WWE also talks about him as some sort of ring general but he's had way too many boring matches and duds to his name to deserve such title.
Shawn Michaels is also overrated by the WWE and fans to some degree. He was never a draw and even if he can do a lot of stuff in the ring, I feel like a lot of fans are fooled by his backflips and superkicks. I mean, he's a thin guy for wrestling's standards, so it's not so surprising that he was rather agile. Also, he never seemed to be that good with holds. Even in the screwjob match, it's like Bret is telling him "other leg, Shawn..." and ironically seals his own fate
. But yeah, fans and WWE talk about HBK as if he's a top 3 ever guy but no. Again, that doesn't mean he was a bad talent, but just not as great as WWE make him out to be. WWE likes to rewrite history and embellish their own stars, just stating a fact. Anyone who''s been watching WWE for more than a 2-3 years should realise that.
I'd say Cena is overrated as well, but at least a lot of wrestling fans seem to be well aware of that, so I don't think there's much of a point in mentioning him. Criticisms of Cena have been discussed on a daily basis since mid-2005, so I'm not about to beat that dead horse YET again. Plus, at least, despite all of his flaws Cena was definitely a big draw for his era. He wasn't the "guy who worked with the draws" like HHH was nor did WWE lose money and go through one of their worst years ever with him on top.