I watched the first episode.. and while I wished it would have not been so definitely biased towards science (IMO believing in science or even extraterrestrials doesn't mean you can't believe in God) that wasn't the reason I didn't like the show.
It wasn't educational enough for me. I knew most if not all of the stuff that was discussed. Wished it would have gone deeper than what I learned in Astronomy 101. Also did not like the cartoon part, felt it went on way too long.
Wanted it to be more like a Planet Earth with Space. Turned out to be more of a soapbox for Scientology.