Big B5 fan here

I agree that the effects sucked, and the acting was a bit...melodramatic at times (*cough*Delenn*cough*), but the storyline was phenomenal. Big fan!
I remember watching ST:TOS when I was young, and the original Battlestar Galactica. My favorite sci-fi/fantasy shows are:
Doctor Who (esp. 9th Doctor and beyond)
Star Trek (all of them)
B5 (of course. I'm not completely hijacking the thread. Well, mostly, but not completely

)
BSG (I liked the new one, even with the wonky ending; I even watched Caprica)
LOST (ditto about endings)
Farscape (fantastic show! I was upset when it ended)
Firefly (see Farscape)
Buffy/Angel (though once Cordy chopped her hair off and slept with a certain person on the show, things went downhill fast)
Stargate(s)
Am currently watching True Blood and GoT, but am behind on both. And waiting for Doctor Who to start up again soon!
Um...I'm sure there are more. That's all I can think of right now.