Miscellaneous Star Trek ramblings. I have to say Star Trek is pretty impressive. I wasn't into it as a kid or anything - I started watching it in college with TOS, and went chronologically from there. I don't know that I skipped any episodes throughout (I might have skipped one or two of the VOY or DS9 episodes but honestly can't remember). Watching everything for the first time was, for the most part, very fun although I have to say few episodes are really worth rewatching.
TOS is mostly good for fap value at this point. Nearly every episode has some gorgeous actress or other. Aside from that, it's aesthetically charming in the way that "old" media can be, but it doesn't really hold up as well as the others overall. However when I first watched it, I enjoyed pretty much every episode. It was only later on that I started to view it as weaker. Favorite episode: The Menagerie.
Most of the episodes that I enjoyed rewatching were from TNG. I think that series might have been a peak for the show in terms of the raw number of quality episodes. The biggest complaint that I have about TNG is the "Troi x Worf" stuff - it was just completely bizarre. I describe it as "Troi x Worf" because it genuinely feels like a fanfiction or something. Favorite episode: Frame of Mind.
DS9 had some really strong episodes and a lot of weak ones. I can understand why it's a favorite for a lot of people but overall I found it inferior. There were a number of episodes in this series which REALLY got on my nerves, which didn't happen as often with the other series. Favorite episode: Whispers (really a toss-up between this and Trials and Tribble-ations). Also Ezri > Jadzia.
I felt that VOY had a fairly consistent level of quality throughout, even if it didn't peak as high as the previous series. It did get weaker and weaker toward the end with an increasing reliance on a few characters, to the point that it was somewhat relieving when it was over. The various romances were mostly painful as well. Favorite episode: The Chute.
ENT, while being fairly divergent from "the essence of Star Trek," I found to be enjoyable in its own right. I thought it was at its strongest when it broke from the episodic formula and focused on the continuing Xindi/Temporal Cold War storylines. This series should not have ended when it did. It is absolutely tragic that it was cancelled so early. Favorite episode: The Andorian Incident (there might be a better one, but it's been too long since I watched this series, and I've forgotten most of it).
I didn't watch much of the shows released after ENT. Maybe someday I'll check out nutrek but from what I've seen it's mostly trash. I did give some of LD a chance. It was pretty much unwatchable.
As for the films, The Voyage Home was my favorite. I also enjoyed the The Motion Picture. Honestly the TOS films are probably the only Star Trek films worth watching. It's not that the TNG films were awful or anything, but I just don't really remember them compared to the TOS films.