The number of people who clearly had no idea what they were signing up for was always amusing to me.
Example, if you go to a hole in the wall taco joint, you're going to get greasy tacos served on plastic or paper plates. I mean, it's not fancy, but they're also $1 each. By complaining about that on yelp you're just showing off your silliness, not providing anything useful to other potential customers.
I had a great neopolitan style pizza place open in my neighborhood. It was inundated by bad reviews by people who were upset that it was "just floppy thin crust pizza" and so forth.
Over time word got out and its reviews stabilized as their pizza and ingredients are top quality. But man for a while it was all just some idiots who just wanted some dominoes like pizza.
Example, if you go to a hole in the wall taco joint, you're going to get greasy tacos served on plastic or paper plates. I mean, it's not fancy, but they're also $1 each. By complaining about that on yelp you're just showing off your silliness, not providing anything useful to other potential customers.