Things I liked:

Destruction of the colonies, seeing colonies besides Caprica.

Shelly Godfrey and how they explained that (except part of me liked the mystery in original, didn't necessarily need to be explained).

Cavil is a great character and he holds things up very well as the central mover of things.

How they worked Caprica Cavil i to the group of rebels, interesting way to take the character and it also explains why they didn't blow him away when he popped out from nowhere and said "it's a miracle" in the regular series.

Doral's "teal suit" line. The Dorals really are dimwits.

Simon in the fleet and his storyline, nice way to fill out the Simons' character a bit.

Things I didn't like:

There is no plan in "The Plan". When things went awry and they didn't get all the humans, Cavil is just sort of making it up as he goes along. This undermines the main series and makes the "And they have a plan" tagline in the main series somewhat of a joke.

Tori is given no lines and nothing to do besides wander around a bit.

The editing together of the new and old bits seemed a little rough to me, for some reason they didn't seem very seamless.

A rather pedestrian "fill in the blanks" kind of feeling overall. It might have been nice to add something completely new and unexpected in there. There was some new stuff, like the fleet Simon, but that was not much of a revelation, and serving more to humanize the Cylons.

No new 3s/DeAnna scenes. I know this is all to do with actor scheduling, but until the Cavils appeared, the 3s seemed to be running the show. I would think the 3s would have a bigger role to play.

So do you think the boy "John" was just Cavil's imagination, him "killing" any last trace of his old self? I have to think so, it would be kind of dumb for him to just kill a human and risk exposing himself.

I was really shocked that the Cavil on the Galactica killed the young boy. I just didn't see that coming at all.

I'm thinking the boy was in his head, his name was "John" like him, he was killing the last bit of any humanity in himself. Maybe.