Well the main thing is they still aren't doing a whole lot to fix it, its all just a patched up. rather than cooling the thing properly or moving the material to sealed permanent storage, they are just pumping in water too cool it, open to the rods so the water is very radioactive, then pumping the hot water into ridiculous storage tanks. The quickest ones they built first clip together and have plastic seals, and one tank has failed. The more permanent tanks they have been doing for a while are welded so less chance of failing, but its still thousands of gallons of radioactive water.
This is water that was on the ground in the site, they finally admitted to having let craploads of radioactive water get to the sea after everyone knew it had happened for ages.
Tepco should have had the whole thing taken off them, a worldwide team of experts installed and the situation dealt with primarily at Tepco's expense from very shortly after it happened. The worst thing is they keep lying about levels of radiation, leaks they pretend haven't happened for a year + after it happened.
The question is, what about another quake, the essentially temporary storage of massive amounts of radioactive water... what happens if the place gets hit again, what happens to the actual reactors that got damaged last time, the entire thing is a diaster and I dread to think what will happen if there is another huge earthquake in the area... another tsunami would be devastating, but less likely, a big quake to weakened buildings and temporary storage.
There was already unprescendented levels of radioactive crap dumped in the sea, with completely(for some time I'd imagine) unknown consequences for safety of sea life and fishing industry in the area.
Currently its been bad up till now and the consequences might not be known for a long time but you have another serious earthquake and it could get so much worse.