Oh I agree, and we have a better idea of where problem areas are but the world still has a bunch of nuke plants in very stupid places and sitting on fault lines and on islands prone to earthquakes that cause tsunamis in worse case situations is the height of stupidity. I am not an anti-nuke nut. Just a person who thinks common sense needs using when placing your nuke plant on the ground.
The plants that can use steam to pump coooling water seem to be fine. The older plants that depended on diesel generators to supply emergency back up power seem to be the problem. That seems to be because they got deluged with sea water. That can be solved with better design also.
It it the support systems that caused the failure, not the nuclear plant. The earthquake should be a ringing endorsement of nuclear power when properly designed.