Detecting fakes is the wrong question. You don't even try to tell if any particular individual reviews are real or fake. You just read a bunch, and see if they

Detecting fakes is the wrong question. You don't even try to tell if any particular individual reviews are real or fake. You just read a bunch, and see if they are random, or if there is a pattern where many have something in common. If 70% of the negative reviews say anything at all about aimless priorities and never being allowed to finish a job properly before being moved to the next thing, that company definitely has that specific kind of problem.