My very very short review of this movie:
You remember the Blair Witch Project? Remember Godzilla? Take the shaky cam from one add the monster from another, throw in a bit of "realism" and viola! Cloverfield.
I recommend this movie if you are a 13 year old boy, or if you thought 28 Weeks Later was a really good movie. Else I suggest a pass on this one.
But then again, I tend to have different tastes in movies than everyone else.
p.s. If you do watch this try not to think about what you would do, it just leads to frustration.
If you want a more detailed review let me know.