Not too good I'm sorry to say.
I think you have potential though, the idea could be very funny.
The graphics weren't the best.
The drawings needed a lot of work.
I liked the song at the beginning so I gave you a 4 on sound, however the voice acting left much to be desired.
It wasn't very funny, not yet at least, it needs some more work. Not just on what you make each of these 'movie trailers' about but also on everything else. You could tell one of the best jokes in the world through flash, if everything else about the animation is bad then the joke isn't going to be as funny. Not saying that it was all just plain bad, I have seen worse, it's just it needs some work.
Good luck on your next one :)