The other thing I didn't like about this movie was the way Superman solves the situation by picking it up and throwing it into space. That was an anti climax. That's how he solves everything.
Obviously Superman can pick up anything and throw it into space, even a whole continent, infused with kryptonite no less. so it is the most practical solution to a lot of problems. There's very few threats that can't be eliminated by launching them into deep space.