In an open market, nothing is "vastly overrated" - as TYBF points out, opinion is an easy commodity, not easily measured against its own kind. Some members of the species learned this centuries ago when the phrase de gustibus non disputandum was coined; later the French developed "Chacun á son mauvais gout" (well, I modified it for versimilitude) meaning "Everyone's entitled to their own bad taste".

Others, however, have yet to realize that goodness and badness have basis other than opinion and spend lifetimes scrambling around disputing them...just the thing to pass the time away, I guess.