Bad? Sure. Boring? That too. Annoying? Yep.
But toxic? Erm… no. That’s not how that word works.
Toxic, when not used as poisonous, means a bad attitude or behavior. An inanimate object is not toxic. An environment can be made toxic by the people who are toxic. But the game itself is not toxic. It may create toxicity in people after they get frustrated and end up with a bad attitude or behavior.