Taken from Koba's LJ and inspired by cashew's rants:

[tanithryudo]

Introducing: The Fic-authors Inferno! See where fanfics rank in the Fanfiction Circles of Hell! (IMO, of course.)

Typos, Blandness, Ignorance of Topic
Circle I Limbo

Misspellings, Bad Grammar
Circle II Whirling in a Dark & Stormy Wind

Bad Xovers, Bad Parodies, Bad PWP
Circle III Mud, Rain, Cold, Hail & Snow

Author Bias
Circle IV Rolling Weights

Non-Canonicity, Impossible Biological Acts
Circle V Stuck in Mud, Mangled

River Styx

Unexplained Plot Devices, Plot Holes
Circle VI Buried for Eternity

River Phlegyas

Self Inserts, Sue-ish OC's, OOC Characterization
Circle VII Burning Sands

Mary Sues
Circle IIX Immersed in Excrement

L33t Use/Illegibility
Circle IX Frozen in Ice

Design your own hell

Dont'cha just love it that the Mary Sues are "immersed in excrement"? Much more fitting fate then being frozen in ice one circle down. *eg*

And regarding where I put "Biologically Impossible Acts"... don't hit me, cashew... my response to blatant non-canon fics of my favorite fandoms is just about the same as yours is to impossible biology... except I'm not as loud, o'course. :p