Overspending, increasing the deficit, investing a crap-load of money into infrastructure without help from the provincial government which leaves the city with serious financial troubles, and the garbage strike. Arman Hamidian
The garbage strike. It was a pretty big and very publicized issue. Paul Humphrey
What he's done pertaining to environmental issues in Toronto has been his biggest impact, and that's really cool. Alisha Tharani
His Twitter account, because that's all I know him for. Daniel Tsekhman