Everything in the Star Trek franchise since 1986. Except for the 2009 movie.
I agree with you there. They got WAY self-important. Was I the only one who thought the idea of a British Shakespearean actor playing a French starship captain who'd surrender the ship to a lifeboat and everyone was acting like he was the most brilliant starship captain the the whole universe was stupid?
Jonathan Frakes is the worst actor in the history of the world. He couldn't act dead if you shot him. I think part of my problem with the show was that Frakes was supposed to be a "leader-commander" but came across as an out of his depth jerk who couldn't make a decision and used his authority to push people around.
As far as pretentiousness, Star Trek was the most pretentious ever. Star Wars, for the first two episodes, was fun. The entire series went over a cliff right after they rescued Hans Solo from Jabba.