Not everything a person does/visits/eats can be 5* surely!
Ah, well, *NotSpaghetti^, I'm afraid I'm one of those irritating people that leaves mainly 5 star reviews.
But that's because I only write them if the hotel, restaurant, etc, has been outstanding (and only very occasionally if it's been really bad, bad enough to warn others). I don't know how people have the time to review everything, and I just ignore requests to review.
I always read them though and find them very helpful. It's usually easy enough to spot fake ones and you can get a good overall impression, and sometimes some useful tips, particularly for holiday resorts. Sometimes I disappear down a rabbit hole of comical reviews - there are some crackers. I was looking at buying presents for a grandchild the other day and came across one reviewer complaining bitterly that the bath bombs he'd bought didn't "do anything" (it turned out he hadn't taken the plastic wrap off). Another had suggested his child try out their new metal detector by burying their birthday money. The battery promptly failed and they'd forgotten where they'd hidden it, so dad ended up digging up half a field under cover of darkness.
The reviews with a couple of indignant exclamation marks after every sentence are usually good for a laugh.