Wilhelm needs to go! Worst Mayor in NY history?
3rd worst in the past 90 years. John Lindsay still holds the title for worst, since the cultural/social collapse that led to a million residents (namely, the middle class) fleeing en masse. 2nd goes to David Dinkins with the epic-level crime rate (2,000 murders per year) and decision to spend most of his time out at the tennis courts (the most egregious example of a hands-off approach to governing).
Kaiser Wilhelm de Blasio the Red has not wrecked the city to the extent Lindsay did, nor has the crime rate skyrocketed to Dinkins-level proportions. But given 8-12 years, he could begin to actively move the city in that direction again.