Overrated - Late 80's WWF tag teams. Sure there was a lot of talent, but it sure didn't produce much. It got better once the Rockers and Brainbusters got there but if you compare it to what was happening Crockett at the same time there's it is night/day in terms of match quality.
Underrated - Recent Joshi - I sure a lot of people thought joshi fell into a black hole in the mid-'00, but there has actually quite a few good workers still around. Yoshiko Tamura, Azumi Hyuga and Meiko Satomura are debatable top 10 GFOAT. There's also a bunch of really good young workers like Arisa Nakajima, Kana, and Hiroyo Matsumoto now.