The first 2 seasons are genuinely excellent, as is the New Caprica arc in Season 3.
After that? Rambling monkey jibberish leading up to a deus ex machina "God did it!" ending that has killed the show's reputation. I'll always treasure the first 2 seasons though. I just don't think that the show ending with a message that supports blind faith in an almighty plan, and hatred of technology, is particularly appropriate. Bit mental, really.