I agree with G-man on Galactus' demise. It would have been better for the Scarlet Witch to have rendered him corporeal or some other plot device to get from there to here. Also, it kind of killed any prospect of a sequel - something I never usually complain about but with zombie films you kind of want all the zombies defeated in fiendish ways - because the zombies are now cosmic, baby. Other than that small complaint, it was good fun.
