Repetitive ideas: Star Trek means ideas to me, but even so too many of the scripts of TOS, Phase II(70s) and early STNG seem all too familiar. Phase II in particular seemed unimaginative.
I would have to say this, as well. You mean to tell me that during the production of Star Trek: The Motion Picture no one stepped back, stopped, thought, and said, "Aren't we basically doing a big-budget, feature-length remake of 'The Changeling' ?".
Not to mention GR's "Klingons go back in time using the Guardian of Forever so that JFK lives" idea for a Trek feature film sounds too much like a rehash of "City on the Edge of Forever" to me.