Awful, awful movie.
My biggest complaints about the first film were that there was way too much focus on the human characters, and the camera moved so fast and so constantly I couldn't actually make out what was happening. (Plot and acting sucked, of course.)
For all its faults, the second film was much better, because at least the Transformers were there right from the start, and I was actually able to follow the action. (Plot and acting still sucked, of course.)
In the third film... well, I think one of the characters said it best, "What a cluster..."
Back to there being way too much focus on the human characters, with the Autobots seemingly showing up only when there was a need to pull a last-minute rescue. Back to the effects being incomprehensible. (And the plot and acting sucked. Worse still, although Megan Fox is vastly overrated, the replacement was just dire.)
What did I enjoy? Well, I did actually like Sentinel's Nimoy-sellout line. That's about it.
The funny thing is, the person who wrote this one clearly had some grounding in both the Transformers cartoons and the comic book, drawing on elements of both for his plot. I would have liked that... except that that meant just about everything in the film had been done before, better.
I was disappointed by the first two films, but this one... I actually left the cinema feeling sick.