Well, Charge reloaded your barrier in ME2 as well (in fact, a good strategy for ME2 and 3 is to add some shield-boosting components to your armor to get the most mileage out of that; my vanguard currently has an N7 set with a 30% shield boost). Given that both Charge and Nova can serve as combo detonators, it gets really messy. I picked Reave for my bonus power and it's murder for taking out enemy heavies; hit Reave (which recharges your barriers) and then uncork a Nova. It made hash out of the Adjutants on Omega. Same with Incendiary Ammo; hose down enemies with shotgun blasts, Nova, and observe as your opponents become flaming meat grenades.