They had this problem in EQ2 pvp with stealth and evac before they finally fixed it. What really ruined pvp in that game, besides class balance, was K/D ratio, only time people would fight is if they knew for a fact they would win, or had a group and you were solo.
I don't understand how they even thought it was a good idea to put 50's in the same wz as everyone else. We've been putting up with a 50 operative that throws the ball to the other team, then burns down the ball carrier. If you're killing him, he just stealth's and runs off.
I'm curious where these game designers come from, it's as though they have never played a game before and just toss in stupid idea's.