Atomic is a set you need to embrace being in melee with if you want to get the most out of it. Atom Smasher is a devastating aoe, and your two melee attacks hit hard. Beta Decay doesn't do taunts, but it is a fantastic power that will make everything recharge faster when you're surrounded, and also helps improve your survivability. Rad Cloud is not an aura, just a pbaoe hold. Whether you want to use it or not depends on your playstyle.