over rated: ibanez, suhr, epiphone (not including Japan made epiphones), gibson, PRS, schecter, DEAN, taylor
under rated: godin (includes all their sub-brands), G&L, Jackson/Charvel (before being bought over by Fender), Kramer (before being bought over by Gibson), tokai, greco, burny, fernandes, martin, Hamer (refering only to their USA made guitars), steinberger (before being bought over by Gibson), Parker, Orville
neither over rated nor under rated: fender, bc rich, yamaha, ESP, TGM (hehe)
disputed: ed roman guitars, zachary guitars
feel free to add on and discuss.