I don't really like Yelp. I'd rather go into a place chosen at random and roll those dice rather than make an informed decision. I consider this to be more fun but I understand why not everyone is up for that.
You want to know if the food is bad or the servers are mean. Why deal with that if you can avoid it?
I'll tell you why. So later, you can go on the internet and complain. Just make sure your complaints are true before you publish them because the owner will find you, and will call you out.