I agree with Elfman. William's Superman theme and his Batman theme are synonymous with the characters, like Star Wars and James Bond.
You're not wrong about him being a hack though . He's been phoning it in for years now. In fact, every composer in the business pretty much plagerize other composer's work or just ripoff themselves. Elfman is a good example. It's further proof that everything has been done and we've reached a point of oversaturation where past works are being dug up and recycled.
Look at what they're doing now with smart phones. They're going to start pushing "retro" flip phones. It's ridiculous.