I concur. I can't believe I preordered the S3 instead of an iPhone.
Everything would be fine if it wasn't for this battery drain issue; it's unacceptable and only occurs on Android. My previous iPhone 4 never had any issues regarding battery drain...
I had the same problem until I rooted and installed CM10.1 RC2.
It's a problem with one of Samsung's built-in apps. As far as I know, there's no fix other than rebooting (temporary fix) or rooting.