Where did I say that snipers are completly useless in 4s? I said that they have survivability issues. Good snipers will still do group ranked but they are doing worse than in 3.0 because of the nerfs (and buffs to other classes that didn't need that). It doesn't matter if you roll before the powertech's bombs detonate, he will still eat through shield probe right after the roll lol! AOE damage is not what is causing trouble for snipers, it's the freaking dots! As for sorcs, I'm not sure you're aware of what good sorcs can do and why they're superior to most (if not all) DPS classes in the game.
But honestly, why do you think you're the **** in group ranked? You play against the same teams over and over. It's a joke and until BW implement cross-server and/or cross-faction, your rating means nothing. Too easy to artificially inflate it. Anyway, why am I still talking to you? You only listen to yourself.