Yes seriously if it was not for the part after the interval i would have said the movie was a disaster..... O_OThe entire last half of the movie did make it epic to me xd
Apparently there were Decepticons "sleeping" on the moon waiting for the Space Bridge (The device Sentinal Prime created). The Space Bridge Portal first opened to the moon. Then when they took over Chicago it opened to Cybertron....that is how it started to appear in space right next to earth.
As for Optimus' trailer, he stated that they need to get Shockwave and his pet away from his trailer, and that is pretty much what they ended up doing enabling Optimus to get to his trailer without getting stopped by Shockwave or his worm, and as for the Autobots getting captured....yeah I would like to know how it happened but in a way already know. They got overwhelmed by all the Decepticons and trying to fight back while there were Decepticons flying around made it really hard for them but since Wheelie and Brains sabatoged the huge ship/hangor and crashed it into Lake Michigan (only big enough water source in the area for it to crash into like that) enabled them to fight back and whoop ass like champs.
Though I would have liked to see more from the Wreckers, Sideswipe and Dino in that last fight rather than the Wreckers untangling Prime, and Sideswipe and Dino doing their own thing until Sentinal got involved.