Than you miss something m8, cause sin vs demo (or necro) is ridicoulously easy mode for sin.
Only bad sins can't easily kill a demo.
Good sin with T4 gear (Renzi, Kuzo, Zarini, Zakila on Crom) simply destroys a demo in < 2-3 seconds.
I'm not crying about demo for sure (it's pretty easymode class to get kills), but sin LO would deserve a nerf imo.
As well as conq and other stuff pointed out by most people in this thread.
Btw, greetings from Australia.
It was too hard to resist to a PvP QQ thread!