I like the so-called Scooby-Doo ending of TUC, I think it makes more sense that a renegade Starfleet officer would try to kill the president while/and impersonating, trying to blame the Klingons then that a Klingon would come that close to succeeding with that, the Worf ancestor noting "This is not Klingon blood"/someone else discovering and oting It's Colonel West! was sure a bit cheesy but I think still nice to include that another officer had been part of the corrupt conspiracy and effective transition to the two sides getting along more, of course at the same time Chang being the big villain and attacking the Enterprise showed well it wasn't only Starfleet renegades who were/had been the obstacles.
You sure you weren't watching SATC?