Just watched Transformers 3. To give you some background, I actually found Transformers 2 a decent, if not outstanding, movie.
Transformer 3 is the most chaotic movie I have ever watched. It was (what felt like) 3-4 hours of mindless action, unexplained and poorly sequenced events, and completely unnecessary human antagonists. And then there was senseless robot-on-robot brutality, largely consisting of decapitation and beheading, preceded by some inessential speech.
The only redeeming element was Rosie Huntington-Whiteley. She makes Megan Fox look like Gervinho