If you read the books, do not go in expecting it to follow them closely. The Vampire's Assistant, in my opinion, was mostly composed of ideas from book 1, 2, and 11. There were characters from book 3, but the basic plot line from book 11 was thrown it which was interesting. New characters were thrown in, like Rebecca, and old characters were completely disregarded, like Debbie. I came in with an open mind and I have to say I enjoyed it.
When I first heard that John C. Reilly would be playing one of my favorite characters, Mr. Crepsley, I was horrified. How could someone who played a main character in Step Brothers possibly play serious Mr. Crepsley? However, after seeing the movie, John C. Reilly was my favorite character. He did an excellent job and I really loved his portrayal of Mr. Crepsley. Truely! So all those skeptics, watch the movie and see what you think. I can see why people might not like it, but I have to say that I will definitely be buying anything with Cirque Du Freak written on it in the future (Which I'm sure Hot Topic will eventually release). Because, there IS a little freak in all of us.
All in all, I give the movie a 4.0/5.0
**Warning, I am a bit biased. ;)