I saw this movie at 9:45AM for $5 a person, so just about anything would have been worth the money.
On the other hand, it has some really good actions scenes and the animation is much better. The new Transformers are very interesting, but we don't really learn anything about them. There is very little "real" plot and no additional character development. It is NOT a good film for children under 13, there are a couple useless characters that seem to only exist as a running gag but they use a lot of foul language.
This is an obvious attempt to keep the marketing going, but there have been MUCH worst films made.