Guild Wars' ongoing State of the Game addresses are insightful and really do well to keep the community up to date on current affairs. This latest entry reflects upon the recent changes (read: nerfs) to various skills and abilities and how they affect competitive play within the game.
Assassins had much of their killing power sapped by the recent skill changes. Recall allowed players to Shadow Step instantly across the map, which made it possible to split and collapse instantly in GvG. In Hero Battles, a player could cast Recall on a Hero, cap a shrine, and then Shadow Step to safety if the opponent tried to go for a kill. With the ten-second skill disable, Recall becomes a lot less flexible, and generally a bad idea for Monks. However, this nerf alone did not do much to deter Shadow Prison Assassins.
The State of the Game address is available here.