I can get on board with some disappointment in Uhura's portrayal in the Kronos scenes. OK, what if Uhura had gotten the Klingons to join Kirk and company in looking for Harrison, and they all assaulted Khan together? She gets her moment to shine as the Great Communicator in a way that both materially advances the story and hits one of the highbrow notes supposedly intrinsic to Star Trek, in this instance of resolving potential conflicts peacefully whenever possible (in this case, with the Klingons). Plus, Fuck Yeah! is served by the follow-up assault on an Evil Supergenius who's Had Time to Prepare, and which I can assure you I would have made even More Awesome! As a Monday morning quarterback/armchair screenwriter with the benefit of 20/20 hindsight, I can say that I'd probably have preferred that to what we got. However, I think that the writers' intent was to show Uhura succeeding, but then get foiled by Khan (edit - though, I'll admit that my memory is fuzzier than I like to admit).