Slow,maybe. But Gw2 is also a totally different mmo to those you named here. There is no need for that fast updates and progression.
Guildwars2 is the casual players Dreams. How many popular mmo's can yo just quit for a few months, log back inn and just start again with no penalty or catching UP to do. Only loss is player skills ofc. GW2 is truly an unike and greate mmo.