And now that we're in the modern age, he's a moron again.
Really, when it comes to comic book fans, a smarter character isn't necessarily "better." Wolverine won't be making it into Mensa any time soon, and he's wildly popular. The Hulk has been a huge fan favorite for decades and he's got barely enough brain function to maintain bladder control.
Anyway, "better" is always a matter of taste. I've never understood why fans feel a compulsion to build their own favorites up by tearing every other character down. Superman is great for what he is, Batman is great for what he is (though both are mishandled lately).