Also, I have to agree with everyone here that one reason you don't see the big deal is that 1.4 was very kind to snipers. Removing the range on stuns from 30 to 10m is a pretty big deal for you since now you can find your spot and snipe with impunity till they actually come up and get you, but then you have some pretty awesome tools to deal with that too. Other classes aren't having that experience at ALL.
Not true I play a heal specced merc and I do my best to sit 11m or a bit more from most players and I notice it every game. I've never free casted like I have post 1.4 in this game.