In answer to "What Do the Decepticons Want, Again?" I'll yet again quot an critique of the series that I am writing.
As for the new shiny dodad they had to find I actually liked that part because it made all the movies make since when put together.
Think about the Deceptacons plans if nothing had gone wrong.
1. Megatron comes to earth to retrieve the all-spark, not to rebuild Cybertron but to give him the advantage over the Auotobots and turn earth's machines into an army (even though he landed hundreds of years ago and we didn't have so much as a tin-opener but OK whatever).
2. Once Optimus had been defeated the fallen would come out of hiding, he and megatron would scorer the earth for the matrix of leadership, Jetfire would still be on their side so he would give them the information he had thus speeding up their search. The fallen would activate that machine that turns the sun into energon (or whatever the hell it was meant to do).
3. Megatron resurrects Vector-Prime who activates the space bridge and brings Cybertron to earth. With the energon, earth's natural resources, human slaves and the machine race created by the all-spark they rebuild Cybertron,....... and inevitably Vector-Prime, Megatron, and The Fallen fight for control (or enter another stupid rock paper scissors thing), and only one of these three stages has to succeed for the Deceptacons to win, It's one of the best evil plans I've ever seen, to bad it was unintentional and we had to sit through so much bullshit to see it.
(Fixed the spelling.)