Not the best squad, but I found it difficult to beat when I played against it.
Wesley (Engineer): 5-star lvl 31 refined AK12, with ammo pack; running Pickpocket, Repair Bots, Iron Grip, and Healthy.
Shigeru Miyamoto (Gunslinger): lvl 30 flawless L115 with 4 stars and a laser sight; running Quick Initiative, Tactical Reload, and Scavenger.
Bosconovich (Engineer): 2-star lvl 29 Dragon's Breath w/Shrapnel; running Resourceful, Burn Resistant, Iron Grip, and Long Lasting.
T4nK Freeman (Juggernaut): 5-star flawless lvl 25 R870 w/ burst module (because my parents never loved me), running Battle Hardened, Scavenger, Healthy, and Nanomachines.
Mayday (Medic): 5-star lvl 11 Crazy Badger w/ Ammo Pack; running Healthy, Repair Bots, Adrenaline, and Blast Helmet.
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Wesley and Bosconvich are both murder machines at almost any range. Wesley's AK12 will melt through a group of enemies like a hot knife through butter; Bosconvich is optomized for his killstreak, but it is nearly impossible for anyone to survive a rocket from his Dragon's Breath. Shigeru can one-shot almost anyone who isn't either a Juggernaut and/or running Life Support/Adrenaline; her Scavenger perk makes up for the L115's lack of ammo. Mayday is only present to heal her teammates, and is mostly unhelpful in actual combat, save for her Crazy Badger. Freeman... Don't get even close to Freeman, his burst-module shotty will tear you to pieces, and since he is using Scavenger, he will never run out of bullets.