Why Erdogan of all people? He's at least democratically elected and a leader of a half-decent country. There are plenty of dictators still on the list, though I'm having trouble making up my mind which one to vote for...
The one good thing about Turkey was that it was a secular country. Erdogan is trying is very hard to destroy exactly this thing.
I'm not an expert of Turkey, but it seems the guy isn't only in charge of Istanbul, but of the whole Turkey, so of the whole Anatolia, which seems deeply Muslim conservatist, and personally I think he tends to very well manage all the influences throughout his country while in the same time he developed the economy, I'll personally better rank him as a good leader.