There might be some spoilers here. I'll try to keep them to a minimum.
I liked it.
Wail away BG purists. It's not like you didn't know it wasn't going to be a remake of the original series. It's not like SciFi and the creators didn't make it absolutely clear from the outset they weren't going to simply redo the original series with updated FX. They made it quite clear that they were going to rewrite from scratch. Oh, they kept a lot of things. The story concept and some of the ship designs remain. The characters have been largely rewritten and redeveloped. They don't resemble the characters from the original series at all. Cylons have advanced significantly.
It's different, more gritty and edgy than the original. The Cylongs are bigger and badder than ever. Characters are harder and more complex. Galactica, the Colonial flagship in the original series, is set to be decommissioned and destined to become a museum in the new series.
I liked the tributes to the original series they put in. There were exhibits in the museum-to-be' showing a Cylon and Cylon basestar from the original series. The Cylon ships have the red eye moving back and forth, as do the mechanical Cylons. The Vipers look mostly the same (all the fancy new ones get wiped out).
There were a few things I didn't like. The technology isn't quite as advanced as it was in the original series. Vipers shoot machine gun style, the Cylon ships launch missiles and attack with nuclear warheads. Galactica is kind of ugly looking, but I'm sure it will grow on me, just like the Enterprise-D did.
As just a 2 part mini-series, I didn't think it was long enough. I wanted more. But hopefully, more will come in the form of a series.
I wonder when/if the series will start.