Truth of the matter is you play to your strengths....if your ranged spec'd your probably better to defend in Huttball.
If your the stealth spec, hide in the endzone for passes. If your team and your stealther is smart you can win a match in minutes. Pass to the stealther as it pops out of stealth, stealther runs the ball in and restealths, rinse repeat.
All classes have advantages, just have to learn to play to the strengths.