That's not balance at all. If anything they need to limit the number of marksmen and infiltrators to two per team, they're about as useful for objectives as exos, except there already is a cap on the number of exos. Tacticians are basically regular soldiers with a standard rifle capable of capturing spawnpoints, the more tacticians the better.
Objective related kill = CAMP, the only difference is that you have cloak and the person you're shooting at can't see you until he has his sights on you. You don't even need cloak to snipe or to camp, when a weapon like the M82 allows the player to pick someone's head off from halfway across the map, and that was back in KZ2 when there was recoil.
It's not like I dislike snipers per se, I dislike people who basically turtle when things get tough and they don't want to hurt their KDR, they hide somewhere and try to milk kills while the team gets hammered in warzone, those people tend to play as snipers, half the time those people put on their cloaks and block the fucking doorway, too stupid to move the fuck out of the way while other people are actually trying to do objectives.