All of them. The series has had many flaws (overlength, lack of plot, slow pace, badly written and acted characters and visual effects that just aren't very good) but Bay did nothing to fix those problems.
If you had shaved an hour from each of the films, put the focus on the Transformers, did better effects (something like what Real Steel
did, which combined traditional effects with CGI) and gotten good actors in the leads (my suggestions: Anton Yelchin and Kat Dennings with an Emile Hirsch type as the main adult), you could have had something. Instead, it's just dull and overblown.
edited 15th Feb '12 5:11:51 PM by Buscemi