One problem with Superman, in general, not only the live-action stuff, is his strength of plot. A bit consistency would be nice. Does he get exhausted? What's his maximum flying speed? His maximum strength? Why does he have trouble catching up with a missile, but then he can go in lightspeed around the Earth? One moment he looks pretty exterted lifting a car, the other moment he lifts and entire continent/island.
In the extended version of the first Superman movie it was said that the missiles had a new auto avoidance system and at one point he flew in front of the missile but went around him, so he had to fly in behind them and push tme into space. And yes post Crisis On Infinite Earths, John Byrne set up some limits to Superman's powers.