Seriously dude, who would've thought Ben Affleck would make a niche Batman, a lot of people were skeptical back then too. I mean, they butchered the character but that's different. And even then some people didn't like Batfleck.
Just give the guy a chance, he is a good actor if you would just watch his other movies.
Some people liked Val Kilmer as Batman. Interpretation of what a real life Bruce Wayne should be like is pretty open. Another important note- Bruce Wayne is a billionaire trust fund baby. So if we look at the types of people that fit that role believably in 2019, Rob there looks like a punchable kind of guy you’d see parking his car in 3 handicapped spaces at once in front of a fancy venue, etc. he at least looks like a “play boy” of our age, so a modern Batman might actually not be so far off from him- with some time at the gym of course.
Just give the guy a chance, he is a good actor if you would just watch his other movies.