1) The end game is a little borring, have no challenges. Gw2 need a real function to guilds, a challenge like guild vs guild. Someting like a war to conquer someting.
Yes we have WxWxW, but it no will define is my guild is the best guild in the server.
2) Mounts in PVE, some times is real expensive use the waypoints, and mounts decreases this long journeys.
3) House system, i simple love a fact to have a place to call mine in the game. I will be very happy if arenanet put it on the game. Tink how much stufs arenanet can sell in the black lion market! 
4) My inglesh is crap, sorry about that…