A skilled operative will be more of a boon to a team then a sniper ever will. If it's a rated game then the medic operative is the preferred healer for any team. if you want to solo queue pugs then the concealment operative, while not traditionally over powered, is possibly the best utility class in the game. A concealment operative that is playing to win the game (attacking and defending nodes) is incredibly effective, unfortantley concealment is a bit weak combat wise, but the great thing about pugs is most of the other players are too. Also a concealment operative is great for exploiting the one weakness most pug teams have, poor organization and delayed response time. Concealment is possibly the best solo capper in the game, second maybe to the infiltration assasin.