Romantic, creepy, occasionally funny (intentionally and unintentionally), and ultimately enjoyable, Breaking Dawn Part 1 was an interesting exercise in how sometimes the source material shouldn't always be followed. I don't really know how to review this movie without bring up some of the major plot points. So if you don't want to be spoiled, I'll say that it was a faithful adaption, for good or bad. It didn't add anything new to the franchise, and won't sway anyone from their opinion of the series. If you like the books and movies, you'll probably like this one. If you don't... then you won't.
Major Spoilers Below!