Well said, It's very obvious that this isn't caused by any routing issues.
I think the people that blame the issue on ISP/routing are either not playing melee dds (affected mostly), or they only macro 24/7 and never notice the hit lag.
When you actually play a dagger, tyrr, or evis it is terrible. The hit rate varies between 0.1-0.9x the normal rate. At times it is totally unplayable.