Sadly, I was disappointed, while it's by no means the worst sequel I have ever seen, just compared to the other movie, this was just too typical with the horror and gore, Fright Night was a brilliant and original film that was not only scary but a lot of fun to watch.
He seems weary of her, as convinces himself that she's a vampire, which she does have something planned for him.
They can't think of a way to avoid certain tropes and cliches so they embrace them in the name of comedy.