I think Star Trek is at its best when it entertains and is smart, making even the regular watcher pause for a moment and give a new concept or idea some thought.
I will agree. I know Star Trek is not supposed to be Star Wars, but when the action is good, it's really good.
However, among my favorite Star Trek is "City on the Edge of Forever", "Far Beyond the Stars", "Inner Light", "Chain of Command".
Also, there is an episode of Voyager where Tuvok betrays Janeway's trust for the greater needs of the crew....taking a piece of technology that was forbidden to them by the planet they were dealing with, and that Janeway supported that forbiddance (I just made that word up...lol). Anyway, Tuvok confesses his complicity and authority over the plan that betrays Janeway's trust in him. To me, it was one of her finest moments of acting in that show...because she so straddled the emotional line between being authoritatively angered with Tuvok, and wanting to cry at the personal strife that his actions caused her. It was a beautifully acted piece that remains one of my favorite scenes in all of Star Trek. That scene nearly moved me to tears.