It seems pretty obvious that something is off when a company has 50/50 good and bad reviews, with the bad ones offering a ton of detail, and the good ones way too positive and overly "corporate" with no detail.
Yep, the fastest way to spot a fake positive review is to notice those seem to be written from the perspective of HR, focusing on things like "fast growth" and "lots of opportunities" that are of little to no concern for the typical person, especially if they're listed as the sole positives. A typical dev is less concerned with the growth rate of the company and how many offices are opening in places thousands of miles away -- they're more concerned about their local delivery team, their local office, etc.