This isn't going to be a really detailed review. I'll need to wait until I've watched the whole thing through again for that. Also, it deserves detailed review done episode by episode.
So here's the short review: it's absolutely awesome. Best SF show since... well, since Firefly. Sure, that's not really very long. But if you ignore Firefly, then it's probably the best ever.
Things that I liked: Really good special effects. Great space battles. Brilliant actors in all the main parts. The scene where Starbuck reveals her dark secret to Adama and you think "Balls, he's going to forgive her and maybe hug" and instead he says "You'd better walk out of my office while you still can". It's not scared to be dark, in some cases terrifyingly dark. Also has some great comedy moments here and there (especially Baltar's increasingly bizarre conversations with his imaginary cylon lover). The cylon biotech. How certain characters cope with the gradual realization that they are a cylon spy and not actually human at all.
Things that I didn't like: The most cruel cliff-hanger ending to a series that I can remember. A bit too much philosophizing from some of the cylons. The iconic scientific, rationalist, materialist character is a bad guy.
Yeah, that's it. Not much I didn't like. Watch it. Me, I'm going to get the miniseries again and watch the whole lot through to tide me over until I can see series two.