Operative/scoundrel is widely considered to be quite overpowered from the perspective of skilled/experienced players...

The class does obscene amounts of damage in the late 40's and at 50, combined with its ability to cc you're essentially helpless in any sort of 1 on 1 situation, and they are ridiculously good at picking off healers before anyone on your team can react.

Nerf will come in a few months I'd imagine.

Sniper/gunslinger is to be determined as far as I can tell, but I do know that they can drop huge numbers on the post game stats. I've seen a gunslinger in my guild drop 415k, and he consistently puts out 200-300k in average games.