Lifeline, Newcastle, Gibralter?

@Midnight9746 I've been playing her almost exclusively this season so I'd say: yes and no.

Even with her Big Drill, which doesn't come online until Level 3, it's not really that threatening except during the final ring(s) when teams are hunkered down waiting for a chance to third-party. The damage is pretty low to the point I've watched supports tank it out with some cells or (if they're in a building) just take a knock and get picked up for the free regen. The depth is also poor and doesn't really deter anyone near a shield. Plus Newcastle's walls will zap it which can render her useless there.

Wrecking Ball is obviously significantly less useful since any shield can be dropped to prevent it bowling people around but it can be useful for closing gaps to those shields quickly and taking advantage of her best trait: shotguns.

Fighting up-close and around shields is just the worst game of peek-a-boo ever invented but Maggie's natural speed boost with shotguns and her auto-reload perk makes her a strong choice. However, since you can just pick Gibby and have both Maggie's speed and reload-on-knock, alongside the bubble and supporter buffs... the choice is still far, far in his favour.

It was enough of a mistake to not only add another huge, invulnerable shield to the game while also buffing existing shields but downright insulting to remove their counters.