No Danger
I watched this movie recently and while I thought it was OK, there didn't seem to be any serious danger in it. For example:
The generator was playing up, but the blackouts didn't seem that serious, nobody got injured, nothing got broken. There was no "end of the world" vibe with the general population.
Food was running out, but no-one appeared to be suffering, or even slightly hungry.
In the end chase sequence, hardly anyone seemed to be chasing the heroes. They had all the time in the world to fix the water so that they could escape by boat.
The Mayor could have been trying to bump the kids off, but instead, he didn't seem bothered that someone was about to expose him.
Had they amped these up, the movie might have had a bit more life to it.