I was told to take this here so I said this about DS9.

Yeah not to mention that just watching the characters interact was fun and very interesting. The episode where Garak tortures Odo is a stand out if you ask me as is any episode with the Maquis,the fact that they were human and the issues were so complex that often Sisko was hunting them but you never really felt they were the bad guys always made those episodes a favorite of mine.

Oh and any scene where Dukat and Weyoun interacted was a ton of fun to watch.

I really like the episode where Dukat and Sisko crash on a planet and Dukat spends the whole episode trying to justify everything he has done and then just completely flips out at the end.