I actually like the GW1 target calling system a lot. It was limited by the engine somewhat but it's very easy to use. Like being able to call out pings in League of Legends, I long for that in an MMO. Much easier than typing in /RW or chat.
As a tank, do you have any idea how much easier it would make my life if I can ping the target I want silenced and drop a second ping that an AOE is coming by alt/ctrl+click?
Love that function in games. Esp. when you are paying attention to like 10 things at once... make my gaming life easier ffs.