If you liked Battlestar Galactica, watch SG:U.
If you like dark stories with morally ambiguous characters, watch SG:U. (Edit: Well, to be fair, that should be "character" instead of plural... but he's one of the best characters so he can count for more than one person? :P )
I really, really hope it's getting enough viewers to not be canceled (it's getting about as many as SGA did last year, so I'm a bit worried).
*wiggles and wants more more more!*