To brush off the overwhelmingly negative reviews as “review bombing” is to imply that someone with an ulterior motive either faked the reviews or orchestrated a virtual army to write insincere ones, yet there is no reason to believe that happened here.
Perhaps the people in charge at Activision-Blizzard should stop pretending to be victims, and accept that those reviews are the genuine and predictable response to the choices they forced on their customers. Take responsibility, learn a lesson, either fix it or do better next time, and hope there’s some good will left among what fans they haven’t yet driven away.