By nearly every account, it was not a good movie. The Batsuit had nipples, after all.
Clooney explained that working on the movie taught him an "important lesson" about the film industry. Clooney said, "Schwarzenegger was paid, I think, $25 million for that, which was like 20 times more than I was paid for it, and, you know, we never even worked together! We worked together one day. But I took all the heat. Now, fair deal; I was playing Batman and I wasn’t good in it, and it wasn’t a good film, but what I learned from that failure was, I had to rethink how I was working. Because now I wasn’t just an actor getting a role, I was being held responsible for the film itself."