I'm not exactly a fan of Kevin Smith but I have a certain amount of respect for him based on his reputation as a major comic book fan and writer, so I'm sorry to have to say that I really didn't enjoy this story arc. I'll keep this brief because I don't want to bash this, I just want to state what I didn't like.
Granted, it's a short 3 issue arc, but there is no resolution. I hate that.
The villain is just plain dumb. His "thing" is only mimicking sounds, not what other people say (which could have made for some humorous moments at least), if a gun goes off he says "bang", something breaks "crash", someone gets punched "thump", things like that. What's worse is that most of it isn't actual words like that. Have you ever tried to spell out how breaking glass actually sounds? Of course not! Why not? It looks dumb, that's why not. And this comic is full of stuff that looks dumb, but we'll talk about that later. His gimmick is so lame even batman comments on it. He says something to the effect of "these villains are running out of good ideas". No, they HAVE run out of good ideas!
The Joker is more of a pervert than he is a psychopath. Oh, and have you ever wondered what the Joker would look like with a beard? Well the artist hasn't either apparently and yet he still tried to draw him with one. How about Bruce Wayne with pre-pubescent "my first mustache" 'stache? Yup, we get that too.
And speaking of art? It's atrocious and juvenile at best. I don't think I've ever seen a less intimidating Batman drawn. If I find out that one of Kevin's actual 10 year old relatives drew it, I will take this back and add a star to my review, until then however I am assuming that someone was paid as a "professional" artist to do this and my opinion stands.
Okay, maybe I wanted to bash it a little... but I will say one positive thing... and then one more negative thing. He makes a valiant attempt at a clear, heartfelt, revealing conversation between Bats and a semi-sane and stable Joker which produced exactly one worthwhile and memorable piece of dialog (this is not word for word, so as not to be too spoilery)... "I don't hate you because I'm crazy, I'm crazy because I hate you. Once you're dead, I'll hang it all up and stop killing people I don't know". Relatively brilliant, however, the entire scene which this takes place within turns Batman into a 6' tall pansy in a leotard and cape! It almost completely undoes everything Alan Moore accomplished in "The Killing Joke". Sacrilege.