I think he would've handled the Dark Phoenix Saga differently.

In X-2 they were already setting up for it, so it would've been the main focus of the 3rd movie & maybe the 4th movie would've been the war between the mutants & the government.

If Michael Bay did Superman it would've been a colossal critical failure. It probably would've made 1/2 billion, but any sequel would be shunned by the public.

Nothing would've changed w/ Batman. A Michael Bay Superman movie would'nt affect it, no matter how much money it brought in.

The Marvel Cinematic Universe would've still happened, too. Stan Lee had dreams of that happening since the 60s & that dream carried on from every Publisher/President of the company ever since.