I’m not going to pretend that Batman is a franchise with a long history of integrity and gravitas. The darkness and grittiness of Nolan’s trilogy doesn’t erase Adam West’s spandex-clad run in the ’60s or George Clooney’s Bat-nipples in 1997. I love Batman in all forms, but when it comes down to it, it is still a series about a grown man who flaps around at night dressed up like a giant bat.
If you’re going to cast a new Batman, you have to keep the context and vibe of the project in mind. 
Henry Cavill as Superman? Yeah, that works. He’s got a lot of talent, and he’s fresh-faced enough that he can easily embody an iconic role. I can get on board with that. 
Teaming up with Batman? OK, cool. Let’s cast somebody on a similar level as Cavill, maybe Idris Elba, or — oh. Ben Affleck? Blockbuster and tabloid star since the ’90s? Director and star of possibly the most widely promoted and overexposed film of the past year?
Ben Affleck’s face is the opposite of fresh. His face is the leftovers you see in the back of the fridge every day for months and keep meaning to throw away. Handsome leftovers, but still, how are we supposed to see this as Superman versus Batman and not Superman versus Ben Affleck?  
Not only is Affleck a bizarre and terrible match for Cavill’s Superman, but he just doesn’t have the chops — or the power — to follow Christian Bale’s Batman so soon. He’s a large ham, and Batman is already balanced precariously on the edge of camp. 
And you know what? A hammy Batman can be great. But for a project that seemed to be taking itself seriously so far — especially with rumors of Emmy-winning “Breaking Bad” powerhouse Bryan Cranston joining as Lex Luthor — Ben Affleck just doesn’t make sense. 
Whatever. Let me know when somebody makes a Wonder Woman movie.