They were long "ruined" before TNG got to them. "Klingon" seems to be their word for "moron," since virtually any time a Klingon was going to do something egregiously stupid he was likely to preface it with something like "We are Klingons!" Stupid like, say, every Klingon in TSFS...or just empty bluster and posturing like those in ST 4 and 5. Or a simplistic moustache-twirler like Chang. Perhaps Abrams will finally do something interesting enough with the bumpheads in this next film to set them up as major antagonists in the third movie.