Also, you need to define "average" a little bit better. 15% of players or less on each server have cleared Final Coil, so assume we have a 30% hardcore/midcore playerbase. This means the "average" player is a more casual player who most likely does not fully utilize their rotations well and puts out far sub-optimal DPS for their class, and thus would be considered "bad" by efficiency standards, let alone player opinions. Sure, some of the more casual people still learn how to play their job quite well and put up respectable numbers, but this territory of "average player DPS based on class" is just asking for a flame war.

A better question to ask is "What is a DPS range based on ilvl for a competent/decent person to put out on a regular basis?" which is slightly different than the hardcore question of "How much DPS can a class push at certain ilvls?" though one might try and give answers for the latter to the former with black/white justification.