https://www.change.org/petitions/arenanet-http-support-guildwars2-com-port-gw2-to-linux-ubuntu-fedora-etc
By signing this petition we get a small chance to get a linux native gw2 client or even get away from dx9.
The advantages of using opengl graphics is that it’s cross platform compatible, can run on windows, mac, linux, ios and android with no need to change much, just build for the target system, opengl is better it terms of performance than dx9 and valve supports it as a board member of the linux foundation.
In the link above you will also see a video with guild wars 2 running over with wine but don’t be fooled, while it runs it’s not playable unless you have gtx 660 or better and above all a really strong cpu.