I wouldn't even worry about a subjective review like "this tea tastes like shit". Even if it's the finest quality tea in the world, someone is going to think it tastes like shit.
I would worry about reviews like, "ordered, never received product, called owner and he told me to 'fuck myself with a pointy stick'". That is significantly more damning, since it reads like an account of a factual event, rather than an uninformed opinion.