Incompetance doesn't cut it eh?
OK, as Emperor, he was responsible for the actions of his ministers, he appointed them. So, corruption, abuse of powers, theft, murder, [this is tricky, I amit], illegal exile [internal as well as external], undue influence- that alone is a bag of worms. violation of whatever justice there was, arbitrary punishment, illegal servitude.
That should do for starters?
Best,
Robert