In what ways does Twilight break the "vampire rules"?

E.g., being exposed to sunlight; no reflection in mirrors; burn when
exposed to a Holy cross or blessed water; drink blood; MUST be invited
in somewhere before going in; cast no shadow; sleep in a coffin; etc

OR in what ways does it follow the rules?

I don`t want any "I love it so much" or "it sucks". I would like an
objective answer, please?

Thanks! I will choose BA in a few hours.