I saw the Seagull S-6 in here, Underrated? I don't believe that, I have always read very good reviews about it, So I tried, Liked and bought myself one.
Epi"s underrated? yep I agree with that... Taylor?? well I have a DN-3 I think this one is underrated, I really like mine although my Gibson gets more play time.
I think overrated could be any of the big names depending on what forum you ask, But for me the Boutique guitars are over priced thus to me overrated.