Mariko Yoshida - Her 1999-01 run as good as anyone's in history.
Azumi Hyuga - Great ace, versatile, excellent seller, great matches during Joshi's dead period.
Megumi Kudo - Along with Foley and Onita, the best ever at working the hardcore style.
Clive Myers - Best British guy outside the usual suspects. Great technician + personality.
Yoji Anjoh - Same argument as Myers but for shoot style.
Most "most underrated" actually become "overrated" with time and pendulum & "underrated" accumulation effect. If I hear yet another time that Brad Armstrong or Hulk Hogan are underrated, I might throw up.
On the other hand, I'd say that, for instance, Hulk Hogan was a better worker than Ric Flair at some point in their career (WCW 1999 is what I'm thinking about). Or that Brad Armstrong, as solid as he was, never put it together like Tito Santana did in the same kind of very basic 80's babyface work, which is why Tito had quite a bit of terrific matches and Armstrong a whole lot of solid yet unengaging stuff.
I think this is spot on. And since we are on that subject
Blue Panther - I've done a 180 on Panther. Used to think he was one of the Lucha greats but looking back I have found a lot of his matches disappointing.
CM Punk - Good worker, charismatic but no where near as good as his peers. Lack of high end stuff outside of the Joe Series and the Brock match.
Tamon Honda - A weird pick since he works the kind of style I usually like but think he is underwhelming more often than not and the praise is hyperbolic.
Ted DiBiase - Pretty versatile and dependable but more a solid hand than a great worker.
Keiji Mutoh - Wildly inconsistent
Andre the Giant - I can understand the appeal since he was something unique but in terms of actual good/great matches, he has very little going on.
Harley Race - Mind numbingly boring
Hulk Hogan - I won't deny the energy and charisma during his prime but as a worker, he was not very good. Best matches were against Bockwinkel, Fujinami, Tenryu and one guess who was doing the heavy lifting in those matches. Alluding to the point El-P was making, just because someone is "incorrectly" labelled as terrible, doesn't suddenly make them good or great when you try and rectify that perception. The pendulum effect describes it perfectly.
Steve Williams - Misawa got a great match out of him in 94 but I find him pretty dull in most other settings. Worst Kobashi opponent ever by a huge margin.
John Cena - Still like him quite a lot, great ace. But his big match formula + many matches do not age well at all, inconsistent, lack of high end stuff.
Dustin Rhodes - Really liked him in 91-94 but he has gaping holes in his career + inconsistencies + lack of high end stuff.