Wow this is surprising. I hadn't read it but I'd heard Superman catches Thor's hammer, but I didn't expect he actually stopped the hammer strike in his open palm. Should he have been able to do that, given his magic weakness?
I just assumed he stopped Thor's arm or something.
If you were surprised, i was flabbergasted.
However, as some posters have pointed out, writers interpret the weakness to magic differently.
If magic lightning can severely hurt Supes, i don't why a magic hammer (for all intents and purposes) damage him seriously.