Ask not what your assaults can do for your team, but what your team can do for your assaults.
The best use of Atlas is suicidal, the head of a spear push, making a few full-damage blasts of AC20 and SRMs while you spin and twist. Soak up as much damage as you can to make sure that all opponents have no heat to spare when the rest of your guys roll in to fight them.
In the best scenario, not only are opponents hot from fighting your Atlas but once you're finally down, they have so many other targets in front of them that they cannot agree on who to focus. As a long-time Atlas pilot for NS, I get to enjoy sitting back and doing nothing for most the matches since I'm always first to die.
The D-DC is great because its shrouding ECM is frustrating for the enemy to try to make consistent target calls during the melee, however the other variants that have Center Torso laser mounts are also fantastic because even if sides are blown off they are still relevant to the brawl and require that much more investment by the enemy to take down completely. Zombie assault mech with a very slim CT hitbox and which comfortably rocks STD350 engine... pretty fun in group play but I can understand there being little to no appeal in taking one in a pug match.
Another edit: UAV is surprisingly good to have on an Atlas, as you will have an opportunity to place it so close to your enemies that they can't look up and get it. If they do decide to do something about it, it's one less set of guns looking at your buddies, and if they don't do anything about it, the carrots both help your team and reel in some posthumous spotting c-bills. It's not a lot, but victory ought to cover it.
Edited by PerfectDuck, 08 December 2015 - 01:30 AM.