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I realised recently that during my time in GW2 I had not get annoyed or pissed off by another player during PVE playtime at all (I didn't try PVP to my shame), which is (sad to say) pretty usual for me in most games. This got me to thinking about whether ArenaNet were actively trying to create a real friendly and fair environment within the game - which is probably a first.
Most if not all MMO's I have played have gameplay mechanics that allow for all sorts of annoyances - from players running in and stealing the freshly popped quest NPC, to the tank having the wrong gear for a dungeon and not telling you, to the level 80 running into town and killing all the quest NPCs, to being ganked by a guy 30 levels higher than you whilst out questing (repeatedly).
However, Guild Wars 2 has things to counter all of these - so they just dont ever happen. They have everyone getting a quest update who helped kill to the NPC, to removing the gear grind and making it skill based, to making everyone in an area the same level. In fact almost every annoyance in most MMO's seem to be countered by Guild Wars.
I can't think of another MMO that seems to do this - but I may be wrong (excluding Hello Kitty Online and Clone Wars - although I'm not so sure about Hello Kitty, it always looked a bit evil).
"When people don't know much about something, they tend to fill in the blanks the way they want them to be filled in. They are almost always disappointed." - Will Wright