Thing is that when a DpS is doing more than 35% of the total dmg done in the dungeon, I can only assume that the others are slacking. I have no problem with newbs or people who are ungeared, but I will not tolerate people who are not giving their best or at least trying to do so. Slacking/afking/dcing indefinitely and being rude are the only reasons I will initiate or agree to a kick.
If you think that your dps is low only because of gear, inform your group. Secondly I strongly suggest checking noxxic for a basic understanding of your class' rotation and how to handle it. If you are a sitting duck meleeing the boss and expecting the others to carry you, then I will kick you and be happy about it too. 70% of your dmg being Melee is not acceptable, sorry.