So we all know what a Michael Bay movie looks like cinematically (aka. fast moving camera, explosions, etc...) So I'll focus on how I imagine his script would be different.
-The villain would be a 10-foot tall Brainiac
-Batman would wear his armor through out the film. His vehicle would be larger, looking more like an impractical tank.
-Cyborg would be a US soldier who was lost his limbs in the Middle East. He was taken to a pyramid where a "mysterious technology" had been left behind by ancient aliens that will turn him into what he is.
-Wonder Woman will spend a lot of time hitting on Batman. At some point her armor would of been destroyed and replaced with something skimpier while the film claims it's more powerful.
-Aquaman is out. Instead we get a second female character in the form of Powergirl. She will have been pursuing Brainiac or something like that... Naturally she has no idea why the men of Earth find her so alluring and sees no problem with even walking in naked on the rest of the League. At some point, Batman will give her her famous uniform.
-Flash basically never stops zipping around. Also he's like 14, has a mad crush on Powergirl, and Batman has to mentor him like a father-figure.
-The US military shows up to help in the final fight, which is in China for some reason.
-Superman slaps around the league, but his boyhood crush Lana Lang (played by Meagan Fox) shows up to remind him of who he is.
-The Vice President would be exposed as an ally of Brainiac.
-At the end of the film, Cyborg would be standing alone in a room reporting to a tall, shadowy figure on Superman's return. It would end with Cyborg saying "... master Darkseid"