I was going to post this to the months-old thread about Cloverfield but then... KA-BOOM!
Anyway, I'm way behind the curve but finally saw that last night. Enjoyed it a lot, due to what had been posted here and what I had heard from other people I fast forwarded through the first 18 minutes, right up to the first explosion. You could really just tell that the character motivation wasn't going to mean shit, so why bother with the filler?
Pretty much everything after that was golden, the guy holding the camera got a little annoying but it was minor. Really liked the parasites, particularly their first scene. I would have liked to have seen more of them, but I guess it would have been a bit farfetched to have them keep running into the things but avoid getting bitten, and then exploding in a bloody mess in short order.
Very fast paced, for the most part they cut out the bullshit you get in a lot of these movies (except for the previously mentioned opening 18 minutes). Glad I didn't see it in the theater though, while the booming surround sound would have been a plus the movie was well under 90 minutes w/o closing credits, and I think it was under an hour without the opening scene.
Also caught Revenge of the Sith on DVD recently. SO MUCH BETTER ON DVD. Just hit "skip forward" anytime both Anakin & Padme are on screen at the same time and it's better than Return of the Jedi.