I don't agree with the opinion that Bayformers 1 was good. I watched it in the theaters on opening weekend, and left the theater feeling disgusted. I watched the next three out of morbid curiosity (and didn't pay a dime to do it), and regretted all of them.
Roger Ebert gave Bayformers 1 a positive review, but he had complaints. He said it was stupid and badly written, it was sexist and racist, the character designs were a pile of metal-shrapnel trash, the choreography was a shaky-cam mess, and it was too long, but... he laughed, and he thinks the movie is a self-aware parody, and it's something different from the same old output from cookie-cutter Hollywood. So, thumbs up!
IIRC, Ebert said that the reason he went all-in guns-blazing against Bayformers 2 (
"Transformers: Revenge of the Fallen" is a horrible experience of unbearable length, briefly punctuated by three or four amusing moments) is because it was the exact same movie as Bayformers 1, but slightly worse. All of the things he railed against in his Bayformers 2 review were already present in his Bayformers 1 review. If the two movies were watched in reverse order, Bayformers 1 would not have his endorsement. This franchise is not a self-aware parody, because if it was, Bayformers 2 would be the better joke.
I would say that Bayformers 1 is probably the best (least worst) of the Bayformers movies, although that's not saying a lot. These movies are all generally in the same range. The best thing about these movies is the fan-analysis that flipped the entire idea of the movies on their head (
posted earlier in this thread), although I don't believe the theory holds up and it gives too much credit to incompetent hacks.
I really have no explanation for the popularity of these movies, except that they destroy my faith in humanity. Moviegoers are nothing but tasteless popcorn-eating sheep.