Please don't change the current plot summary, it's already perfect.

Nice try, fanboy, but anyone with half a brain understands that the purpose critics is to explain which movies deserve to succeed or fail, and warn moviegoers about which movies deserve to flop before anyone pays to see them, and according to RottenTomatoes, Michael Doofus Bay has had an unbroken record of rotten percentages since his 2nd movie in 1997, which was his only good movie because it was made BEFORE he got his Auteur's License and abused the license to stop caring about quality storytelling and promoting decent behavior and morals.

Also, anyone who understands the rules of proper storytelling knows that the last three Bayformers movies didn't have any plot at all. BEFORE the 3rd movie came out, fans of the 1st movie received the disappointing failure in the 2nd movie, and moviegoers who understood what kind of person Bay was, were already predicting the different ways Bay would ruin the 3rd movie.

When a user in TFW2005 forums tried to blame Starscream's terrible portrayal in the 2nd movie on Ehren Kruger (when it was really Michael Doofus Bay's fault), an intelligent user explained how Bay is the one who has ultimate control over what ends up onscreen.

In the 1st movie (which has been the only tolerable movie in the franchise, with the most decent storytelling so far, only because Spielberg kept Bay on a tight creativity leash at the time) the writers expressed openly that they wanted Megatron to be *THE BIG BAD* ... the villain that the movie led up to, and when Megatron was released, he was an increibly super uber going-to-eat-your-babies type of villain. If Starscream had the guts to challenge him, it'd undermine the entire purpose of the plot of the 1st movie: Megatron = badass.

And the 1st movie was loved by fans of the cartoon(s) because the movie actually had a somewhat considerable plot focus point: AllSpark and Megatron. Once they found the AllSpark, they also found Megatron, and it was game-on for the Decepticons.

In the 2nd movie, it's just a bunch of mish-mash thrown together without rhyme or reason, with explosions and robots. There's no plot. What was the plot? To revive Optimus Prime? Okay, it fails to be worthy of being called a "plot" because the audience doesn't even know what the 2nd movie's "plot" is until halfway through the movie.
In the 1st movie, the plot was the AllSpark, and that much was said IN THE INTRODUCTION OF THE MOVIE.

The reason Starscream didn't act like Starscream in the 2nd movie is because Bay forced the writers to focus on The Fallen and the Twins, aka, the new "BIG BAD" and the new "BUMBLEBEE" type characters. Devastator was thrown in with the idea that toys would sell like hot-cakes. Optimus Prime, the best-selling toy along with Bumblebee from the first movie, also took central-stage again to insure future toy sales.

That TFW2005 user who understood that it was Bay's fault the 2nd movie was so terrible and the reasons why, he successfully predicted how Bay would ruin the 3rd movie 2 years before the movie came out.
The user predicted that Starcream would not likely get any characterization, and he ended up being right.
The user also explained how the 3rd movie would most likely have your typical "MICHAEL DOOFUS BAY WANTS, MICHAEL DOOFUS BAY GETS" type of character that will receive too much focus. And that prediction came true: Dylan Gould was that character, played by Patrick Dempsey.
He knew the movie would be in 3D, which would be distracting and be painfully obvious because the "plot" would suffer (and it did).
And he also predicted how the movie itself would go along with the path set forth by Batman Forever ... the death of movie franchises after the 3rd movie (the 4th Bayformers movie: Age of Retardation, grossed the LOWEST domestically of all four movies, showing that American audiences are catching on to what an egomaniacal, perverted, unscrupulous hack Michael Doofus Bay is).