I didn't see it (I'd been warned about it beforehand), but I have heard quite a bit about it, so some various odds and ends...
The official news so far is that it won't be turned into a series, but despite that, SciFi went ahead and extended the option to renew the actors' contracts to the end of January (so they've got until the end of January to change their minds and resign everyone for a regular series). One conjecture is that SciFi doesn't want to blow the budget with a series that's heavy on FX, and reportedly one individual has been pushing for the show, with the idea of running it as a soap in space.
That's just a rumor, however, so I'd be cautious with the amount of weight you give it.
Edward James Olmos (Adama in the mini-series) stated before the series ran that if you were a fan of the original, you probably wouldn't like the result. I've heard that he got into a bit of trouble for making that statement.
IGN, in their review, wondered why the nukes didn't generate EMP fields that disabled all of the Cylons. Then again, given how badly the original series ignored the laws of physics, these sorts of things are probably forgiveable.
Someone stated that it was the first time they'd seen realistic zero-g physics. Babylon 5 featured this with the Earth Alliance ships (although many of the alien races had more advanced propulsion technologies that allowed them to move differently).
From what I've heard, the similarities between the old and new series pretty much start and stop with one word - names.
The recently released video game for the PS2 is tied to the mini-series, and is set during the war decades earlier.
Starbuck was apparently cast as a female because if the character was a guy, he'd be endlessly compared to Dirk Benedict. And once that happens, it doesn't matter who you cast as the end result will always be considered inferior (probably the one move I agree with, even if I view the end result as somewhat heretical).