I just watched it.
I'd agree with the use of recycled footage, there was perhaps a bit too much. That said, as the plot moved VERY quickly through the miniseries and the first and second seasons that it was helpful to have those parts we'd seen before, just so we can remember what episode we're in.
Seeing the destruction of the colonies was anazing, and it was very well done, possible the best part of The Plan. I mean we'd heard a lot about how much the Cylons fucked-up the colonies, but actually seeing it was something else.
The Cavils' and Simon's respective sub-plots were very well done, giving a hell of a lot more depth to Simon and both Cavils, I especially liked just how different the two Cavils got by the end.
I think possible it's biggest weakness was simply that it it had a lot of time to cover over the first two seasons and the miniseries, and it does feel slightly disjointed because of that.
Some people will moan and bitch (and already are moaning and bitching) about how it simply wasn't two hours of answers to questions and how it didn't explain what Kara was and yadda yadda yadda, but they're idiots becuase those questions are supposed to go unanswered.
I liked it.