Haggerty,
I honestly believe that the game is/will be tuned around OK-quality players using all the tools at their disposal, instead of say, a 2400 rating Arena team in WoW. I've been watching a few more GW2 demo videos and I've been impressed at how quickly some of the players adapt to their characters. Sure, there's A LOT of nuance still missing in their play, and with limited weapons and company, they've barely scratched the surface of potential, but most of these players are adjusting to self-heals each cooldown, popping their elite skill, recovering from their downed state, and occasionally switching to a secondary weapon.
As someone posted upthread, the leveling experience alone might be enough to neutralize the baddies... which I'll try defining for the very last time: People who intentionally play like shit because they cannot be arsed to be a teamplayer; those who put their own 1-2-3-1-2-3 DPS above the welfare of the group.
When GW2 is released, I'll probably be categorized as a really really REALLY crappy player. Regardless of which profession I play, I'm going to be throwing every ability I have at mobs, and I'm going to be attempting every possible cross-profession combo I can. If there's a shiny animation, I'm gonna throw something through it. If someone is glowing, I'm gonna stand next to 'em and cast something. I expect to see at least 50 or more different combo unlocks blaze across my screen that first day of gameplay.
People are gonna be yelling "damnit Foreverlad, just hit the leviathan, quit dancing around!" and I'll be like "nononono if you cast #5 while dodging, and I switch from sword to torch and use #3 maybe we'll teleport to a secret lair!!!1!one"
S'gonna be awesome