I've been using https://www.fakespot.com to flag bullshit reviews for a few months now. After many happy purchases informed by its review analysis, I believe it works.
Well don't take it on trust, validate it works. And keep validating it still works, because one day it won't. Everyone seems to sell out in the end.
I had no idea there's a full scale electronic war on the streets of my city.
Probably not, though, so more likely the fake reviewers will find a way to avoid its detection algorithm at some point.
Very generic positive language.
Poor grammar and or spelling.
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The only sure way is to click on the profile and read the rest of their reviews.