The first movie's dialog, storyline and plot inconsistancies lowered my expectations to the point where I don't really care enough to have any concerns. I just laugh it all off now.
Jetfire walks with a cane? LOL - sure, why not?
Wisecracking twin Autobots making fart jokes for the kids? - OK...go crazy.
A bunch of Transformers that have big wheels instead of legs, and thus still look like vehicles in their jumbled, confusing robot modes? - whatever...it's Bayformers, man!
More annoying character acting from John Turturro, more lack of any kind of romantic chemistry between LaBeouf and Fox, and more inane dialog and broad, dumb humor all around? -- Hey, whatever brings in the money from the masses, right? LOL.
I know what to expect. So the 25% of the movie that's awesome action and effects scenes will remain my primary focus. I won't worry about the rest.