Transformers 2 is best described as this:
Optimus is like "Sam, I left out something utterly and completely important to tell you in the first movie and now the Earth is doomed... again, unless you save it... again"
*lots of special effects orgy and slow motion battles*
Optimus gets his ass kicked and dies. WOW WHAT A PLOT TWIST. That was sarcasm, if you didn't notice. Of course there's NO possible way to bring him back...
*sad scene, special effects, etc*
Sam is like "How the fuck did we end up in Egypt? How the fuck do they build a giant sun destroying device in a pyramid?"
*Megan Fox acts hot, runs a lot, boobs jiggle*
Sam is about to die, but of course gets brought back to life in a cheesy, melodramatic moment.
Optimus comes back to life. HOW COULD WE EXPECT THAT??? Again, sarcasm.
*Old robot rips heart out, Optimus somehow becomes 100x more powerful*
*lots of special orgy and slow motion battles*
Yay! We saved the Earth... Again. This means Earth will be safe... For now.
*third installment gets made*