Guild Wars 2 has some improvements on standard MMO mechanics that are so obviously better that I have found it unpalatable to go back to older MMOs or to play new games that clone them. One of these is the use of hearts and events to level, rather than quest hubs. For the kind of content quest hubs most often deliver (kill things, click things, collect things), hearts just seem obviously better than clicking an NPC; hearing a story about too many wolves, needing wolf pelts, or wanting you to click on six specific wolf den rocks to investigate; kill/click/collect, then going back to click on the NPC. The flow of play is better, and if you don’t feel like collecting things, you can just kill and/or click. Using events to make impromptu groups and to replace “take this message to Bob in the next town” quests is just better.
Also, in GW2, you can almost always rez the NPC in an escort quest. See Rurik or Sara Oakheart.
GW2 also demonstrated that hearts and events are horrible ways of telling stories, so bad that they spent part of the first year trying to retrofit a classic quest system into mail system or the personal story model. They seem to have settled on the personal story model, an interesting choice given how few players would cite the personal story as one of the better parts of the game.