You know, I hadn't really thought about that but you are right. The frst movie didn't really follow Transformers, it followed the human characters and any transformers who happened to be with them. Hopefully now that the characters have been introduced we'll get something more focused on the Transformers themselves, and something a little more 'out there'.
I'd love to see Galvatron make an appearance but it seems they really made a point of killing of magatron in the last film.