I'd say Chris Hero. Most of his early to late 2000's work doesn't hold up well, at all. It took a long time, and a couple of trips to NOAH, for him to have more focused matches and really become a good worker imo.
I agree that Cabana was/is completely forgettable, but I don't think he was ever viewed as a very good wrestler. People thought (think) he had a funny act and was entertaining, but never a "you have to watch him" type of wrestler. Not sure he can be overrated.
Agreed on Low Ki. Great matches and all but his act grows tired the more you see from him, and his ego is too big for him to evolve as a wrestler.
Morishima was legit. Especially in NOAH. Both were believable as athletes because....both were actually athletes and did athletic stuff.
Morishima was largely (don't ask me how) a disappointment, he never had the kind of run he had in ROH and was never able to "figure it out" as a star in Japan. He had sparks here and there, but dude should've been a success and the combination of NOAH's retarded booking and him never putting everything together fukked him. Don't think he's overrated though, mostly because I don't think anybody rated him that highly
