The Klingons looked great in STID. Too bad they didn't actually do anything substantial. It's like "uh we can't go two Star Trek movies without them so let's put them in here somewhere even though they just serve as fodder for the main villain to make him look like the ULTIMATE BADASS". And then super saiyan (sorry, I mean Khan) proceeds to make them all look like chumps. Who can really take Klingons seriously after that poor showing.