I am completely ok with the absolute derailment of this thread.
I have to agree with Skaltura about TOS. I grew up with TNG, and part of what made me love it is probably that it was one of the only shows my dad made a point to sit down and watch every week. If he couldn't make it to watch it when it came on, we'd have the VCR set up for it, so it holds good memories of the family together watching. But in addition to that I feel like that was a great series filled with fantastic characters. DS9 never really got me hooked. I'm not really sure why. I would watch if it was on, but I haven't ever gone out of my way to watch it all, so I might do that sometime and change my mind.
I did enjoy Voyager, but primarily for the same reasons Carl-E cited, The Doctor and Neelix. In fact, I think the characters who explored humanity were my favorite throughout every ST series: Spock, Data, The Doctor, and (from the very little I remember of DS9) Odo, among others. I wouldn't be surprised if I misinterpreted Odo though, again given my lack of familiarity with the series.
I caught episodes here and there of Enterprise, but everything about that show seemed forced to me, like they were trying to appeal to a completely different crowd while still hanging onto enough ST resemblance to keep the name. To me, Enterprise was the Super Mario World 2 of the ST universe I guess.
I did absolutely love the reboot ST movie though. I thought it was true enough to the original spirit, but relatable to me, unlike much of TOS.