Im both Native and cRPG player, any time i play on either one them, i see hate towards the other. I do personally prefer native since i like competitive play. Why most casual cRPG players think that native players suck is probably since they join a random server, like 22nd siege or even nditions and just kill random players there. Casual cRPG players are probably better then casuals in native, since if you want to play cRPG you have to invest some more time into it then native just to grind and you will improve atleast somewhat while doing it. There is no doubt though that at the highest level native players are much better since they focus on improving instead of grinding.
I don't see why all the hate towards the other though. cRPG is meant for a more casual crowd while native is for higher level competitive play. Nothing wrong with either, just a matter of personal preference.
For M&B2 i do think that there should be no levelling system. It would seriosuly hinder competetive play, you can always make another mod for that. Although some kind of ranking system etc that dosen't affect your character ingame abilities might be fun.