I think he's alright. Certainly an improvement on the previous incumbent!
Can the issues with the congestion charge and removal of free travel for under 18s be laid firmly at his door? If so, how?
Otherwise, I see all these casual references to Sadiq Khan being single handedly responsible for the increase in knife crime and all sorts of other accusations.
Please spell it out for me if you think he is a poor Mayor ... how and why?