I am staunchly anti-"mingling" of PvE and PvP. I understand that it's not a big deal to people who PvP casually or otherwise, but many "carebears" are basically just lambs to the slaughter in these cases. I've certainly had my fair share of being trolled, camped, hunted, farmed, whatever you want to call it, just trying to accomplish one task for an otherwise PvE-oriented achievement. It's not even remotely fun and frankly brings out the absolute worst in players. I will always believe that these two modes should be kept completely separate.