Found what may be the most autistic DOOM wad ever:
http://doom.wikia.com/wiki/Super_Sonic_Doom
I've played it and it's kind of interesting but holy shit, the use of Sonic the Hedgehog elements (specifically monitors instead of regular power ups), and music from the Sega Genesis games. Also tons and tons of in-jokes that no one but this guy probably gets, and he doesn't actually know what the Seven Deadly Sins are; he doesn't include Wrath somehow, but has Vanity instead, which would fall under Pride.
I don't know, the levels are kind of cool but all the super-obscure references and.... for fuck's sake, Sonic the Hedgehog?