His idea is actually quite cool, but Snyder and DC used him too much, and he becomes ridiculous. I mean, it's not even brainer that the design of Batman Who Laugh really screams awesome (despite being inspired by Dark Judge of Dredd as obvious as the sunrise from the east) and the mix between Joker unfear-chaos tendency and Batman's brain seems a cool idea to sell to the casual readers. Now, the problem is how they (DC and Snyder) used him. He is really oversaturated, which is not even funny.