I completely understand where you're coming from because I felt the same way when I heard the news. I did not think that Ben Affleck was going to do well as Batman and even now I still have my concerns. However, after you take a deep breath and go back to assess the matter, you start to realize that you've seen less of the positive potential behind it. Fans are going to lambaste Affleck until 2015 and even after if the Man of Steel sequel isn't up to snuff.
However, I remember fans feeling the same way about Michael Keaton before the Tim Burton films came out. "Mr. Mom" and "Batman" are two names which are worlds apart. Look at how well Keaton did. I may hold my reservations but I'm willing to give this a chance and I hope that fans warm up to the idea in due time as well.
Thank you for your post, Amanda!