I spent many years either laughing with or at Affleck when he was on. Hey, he's a funny guy but anybody around me would agree that he wasn't a good actor (family/friends). Which is why people went UGHHH when he was cast. It's not just Daredevil, it's because he's not known to be a great actor.
I usually have to convince people, my brother for instance, that he has improved. To watch The Town because he's solid there. But they dont want to hear it. Of course they see the new suit shot, and they're like THAT'S AMAZING. Yeaaaahh but will you enjoy Ben as Bruce Wayne? Probably not.
Im more used to his new stuff so ill be fine with it. Im not expecting greatness, im hoping for a solid performance at least but i also fear he will resort to his older habits. Like THESHAPE told me, ill probably be proven wrong. And that's a good thing. He's still not a fantastic actor though, and never will be. Heck, Cavill is not great either but he fits. Maybe i shouldn't expect anything after TDK Trilogy. Maybe this universe is not about great acting, serious this and that, just a fun time like what Marvel does.
Chris Evans and Chris Hemsworth are two actors i can't even stomach outside of their hero characters. But they fit Cap and Thor like a glove.