Of course its legs will be worse than TDKR; Man of Steel is a reboot and not expecting to have amazing legs. Well, I never expecting it to have amazing legs. I expected 300m domestically and 450m overseas.
A 50% weekend drop is impressive, given the competition it has had to face the last 2 weeks. And its legs are decent, enough for it to make a good profit. Nobody was expecting Avatar legs here.