In Transformers: Revenge of The Fallen, a new enemy is introduced, who is basically the equivalent of Satan to the Transfomers, The Fallen.
While I enjoyed Beast Wars a lot, I have to say WTF? to your comment about the storyline being better. Do you know how much EXPOSITION they'd have to get through just to be able to start INTRODUCING the characters?
The trailer needs a boost in the editing and sound department. Especially sound. It didn't excite me that much. But I'll hold my final judgment until Monday when the hi-res version comes out.