The horizontal endgame of Guild Wars 2 does not seem to be working as well as intended. Players are using all eight dungeons, but this is not working at all in the open world. The high-level loot is too concentrated in Orr to encourage level 80s to hang out in lower level zones, so non-bot 80s visit the dragons, the dungeons, and Orr. Lost Shores will add an option to that list but not encourage using the 0-70 content. You can find action in the newbie zones, and channeling players together still works pretty well, but most of the world seems very sparsely populated even in prime time (outside the holiday event). The dynamic event model has fewer problems with low density than Warhammer Online, but you group events can sit there for hours, and the same for events not labeled as group content but effectively unsoloable. I am amongst the many people who talked about how you could play in any zone at level 80, so all these good things will come of that, but the reward structure is not supporting that. There are some people who play the content they enjoy without thought of the rewards; they are mostly not MMO players.
You still run into dynamic events that are bugged from launch, and with the less frequent server resets, those can also sit there for a very long time. This lets a lot of players see them, which furthers negativity. If an event can reach a bugged state from which it cannot advance, it will eventually get there, so over time more areas reach bugged states that cannot be cleared. Logging on Sunday morning for my 5 daily events, 2 of the first 4 I found were bugged, along with a waypoint stuck in a bugged contested state from a previous event. This is an uncommon run of luck, but I was not exactly surprised. I am still judging games based on how long you can play until you see a bug, and GW2 is not doing enormously well there.
If they fix the problem from my first paragraph, come back here a month later to hear me complain about how level 80s are swarming newbie events because the problems with scaling let you kill much faster at lower levels.