In a attempt to make the film bigger, better, and more mind-blowing then then its predeccesor, Bay has removed much of what made the original movie so charming. What is left is a drawn out, often agonizing film, filled with in-poor-taste humor that fails to realize the point where it becomes no-longer welcome.
Bay has mistakenly drawn the focus away from the real stars of the movie, the robots themselves. There is real opporunity to explore the new Autobot allies (some of which are not even named within the movie) and their relationships with their military comrades, and their adaptation to existence on Earth. Bay chooses to ignore this, and instead dedicate copious amounts of time to Sam and Mikaela's wooden and unnatural relationship.