Quote from daisychopperPvP is insanely tough to balance with PvE. Just look at WoW, they change it every month or so. People also have much higher standards nowadays than they did - I can't remember ever doing PvP in D2 and surviving more than one or two hits, but I know people still did it and had fun in that environment.
All I'm trying to say though, is that it's not as easy as "remove crit" or "reduce player damage by 90%."
At least I'm not saying that it would be so easy, but it could be a nice start. Now the whole system doesn't work (at least without player made rules) and everyone (or at least close to everyone) wants change in the system