He's pretty fun, but AP Shaco is really out of line, busted as fuck.
shaco goes electrocute into scorch and probably celerity or transcendence, luden's echo, morellonomicon. So shaco himself is basically what you expect, his AA and two shiv poison and his second shaco. The thing that's insane are the dumb jack boxes. you can't even win a trade against them 1v1, lololol, its the stupidest thing I've ever seen. You lose a fight vs. one box, you may not die but the amount of damage you take, losing 30-50% of your health for taking on one 14 second cd jack 'n da box, you lost that fight, lol. It's funny thinking on it, but ridiculously overpowered.
Shaco himself doesn't need a nerf at all, but the stupid jack and the box, holy shit! that REALLY has to be nerfed.
I forgot to add the most important part because i'm high. THE JACK N THE BOXES TRIGGER ELECTROCUTE, you can see the animation! they MURDER you with Electrocute damage