All the PVP elites on PVE servers would be ROFLSTOMPED if they went against PVPers of a PVP server.
They'd complain and want the old system back.
Because real PvP happens on PvP servers. It isn't just a gankfest until level cap (and is still a gankfest at level cap).
More true would be that PvE servers are for people who want to level without getting stomped by max level toons while they are in the middle of questing.
I doubt there is any difference in skill between the server types.