Only problem atm is that in GW2 it’s not that easy to see from what server a player is… from a distance you don’t see the name.. and from the skin you can’t tell.. in DAoC the 3 realms had entirely different races/classes so you could easily tell from a distance.
Are you (color-)blind ?
There are already colors to see from which server the player is.
EDIT: Oh, right, from a distance. Sorry.
You can approach then. :o