TNG, hands down. I still watch it at least a few times per week.  
 
Make it so.

I am not a big fan per se but I respect and enjoy The Original Series the most. Next Generation gets more airtime from where I live so that is probably what i watch more nowadays.

i used to watch the next generation a lot when i was a little kid and i really enjoyed it.  but the new movie is whats up

original good. 
 TNG better. 
DSN a bit dull 
Voyager meh. 
enterprise never watched.

Deep Space Nine for me, though The Next Generation is a very close second.

I'm watching Season 1 of TNG now, and I forgot how much I loved that show growing up.  It's definitely my favorite.   
 
Deep Space Nine was a bit dull, and towards the end it just went off a cliff.  Besides TNG, though, I think that it had the best characters.
 
Voyager was in re-runs recently, so I saw basically the entire show.  I found it to be pretty fun to watch, overall, as they were able to change up enemies and scenery every season, since they're traveling through new, unexplored areas of space.  However, like DS9, the ending wasn't very good.  
 
Enterprise gets knocked pretty heavily (and for good reason, as most of it was garbage), but season 3 was absolutely amazing.  It had a compelling overall story arc that was subdivided into interesting 2-3 episode miniarcs.  Too bad that season 4, and the final episode in particular, totally crapped all over that good work.

tng. best episode ever: 
 

The only good one.
 
Voyager.

I thought Deep Space Nine was a good deal less pretentious than the Next Generation, although it did really go down hill towards the end.
The Next Generation is easily my second favourite though, followed by the Original series.
 
Voyager was god awful.  The characters were terrible, it relied heavily on plot elements that were popular from the other shows, like the Borg, time travel and the holodeck, but pretty much all of its attempts to do them failed badly.
 
Enterprise killed Star Trek, I don't think anymore needs to be said there.

Deep Space Nine. I really loved the darker side to the universe explored with the war. It was really cool.

" I thought Deep Space Nine was a good deal less pretentious than the Next Generation, although it did really go down hill towards the end.
The Next Generation is easily my second favourite though, followed by the Original series.
 
Voyager was god awful.  The characters were terrible, it relied heavily on plot elements that were popular from the other shows, like the Borg, time travel and the holodeck, but pretty much all of its attempts to do them failed badly.  Enterprise killed Star Trek, I don't think anymore needs to be said there. "

" @WinterSnowblind said:

" I thought Deep Space Nine was a good deal less pretentious than the Next Generation, although it did really go down hill towards the end.
The Next Generation is easily my second favourite though, followed by the Original series.
 
Voyager was god awful.  The characters were terrible, it relied heavily on plot elements that were popular from the other shows, like the Borg, time travel and the holodeck, but pretty much all of its attempts to do them failed badly.  Enterprise killed Star Trek, I don't think anymore needs to be said there. "

star trek wasnt killed. the new movie was a success. "

I'm actively watching TNG at the moment, just got up to season 3. It's far too good.

TNG is the best thing ever, the rest are junk.

I watched Voyager the whole way through, just because I happened to be interested in scifi when the show started. I don't like coming in late, and this was pre "you can find everything streaming on the internet". All I remember is 7 of 9 was hot, and near the end they opened a dimensional rift that led to an invasion of aliens that actually looked like aliens and not dudes with shit glued to their face. Also I remember the doctor reminded me of Snarf from the Thundercats. 
So uh yeah. I'd take Farscape over any Star Trek show. They had some crazy looking puppets.

TNG.  I could not stop watching it all the way to the end.

I would like to watch Star Trek after all those references made by the crew here.

TOS.

" Enterprise, could have gone on longer if it wasn't for 1. the writers that hated star trek that worked on enterprise. 2. the anal nerds that watched it and ruined it by telling others not to watch it.  So yeah. Enterprise was better then all the other silly crap. "

DS9 (my mind is boggled that this is somehow behind Voyager in the poll).
 
TNG a close second.

DS9 with TNG being a very close second. Voyager is, overall kinda mediocre (with the exception of the doctor), I've never actually watched much of TOS and I scrubbed most of Enterprise from my memory.

"I grew up with TNG but i like the craziness of DS9.  Enterprise was different, while the writting wasn't great i liked the characters they had.  Oh and Joleene Blalock is HAWT!  "

TNG, once you got to season three.

TNG, natch. But this shit was hilarious!:
 
@hamlaser said:

" tng. best episode ever: 
 

"

I think maybe TOS was just before my time.  I've watched episodes here and there, and it's all just way too low-rent for me.  I think TNG is probably my favorite, but I have a lot of love for DS9 as well.   Voyager was trash.  Also...

@ryanwho

 I'd take Farscape over any Star Trek show.

TNG is outstanding. After it ended I tried to get into DS9, but it didn't hook me in the same way. Voyager I stuck with for about a half a season and jumped ship, no pun intended.

Maybe it's because I grew up with Classic Trek, but that's my favorite.  After that I'd have to say DS9.  It was refreshing to find that the Federation wasn't all perfect and squeaky clean.  The Next Generation was way too cerebral and soap opera like for me.

I personally don't think that any Star Trek series was "bad." They all have their high and low moments. Just some have more lows than highs. Personally I acknowledge that The Original Series and The Next Generation are probably the truest to the Star Trek feel with Voyager and Enterprise being quite different. However, my heart is with Deep Space Nine. I loved the setting, characters, and the adherence to a generally continuous plot throughout the entire series instead of the encounter of the week. War and religion were handled in a way never really seen in Star Trek before that showed that not every part of the galaxy was a peaceful utopia.

From TNG right through to the end of Voyager including DS9 for 14 years it had a continuing story and universe, cant say I have a single favourite series but those three were amazing as they intertwined with each other at times. With Enterprise I think they just dropped the ball near the end and it could have been so much better and could have ran for 7 years like the rest.