They are entertaining at the beginning but soon they become your worst nightmare and I never recommend anyone to play slots,in poker and sport betting you have somewhat much more control while in slot machines you just hit a spin button throwing yourself into total randomness which is programmed to make you lose money in the long run.
I wouldn't go so far to say that no one should play slots. Slots should be forbidden for minors, that's for sure. But for adults it's a good thing in many ways. I myself still play slots, but not more than 30-40 minutes per day, and not every day, of course.
That's a little harsh not to recommend playing slots; I believe he had gambling issues. To begin with, you already know that there is a 60% chance that you will lose your money and a 40% chance that you will profit when you gamble. We gamble to have fun; we occasionally win but frequently lose; we play for the happiness it brings us. Slots have been in the gambling world since then, and while it is already programmed to have a slight chance of winning, if luck strikes you, it has the possibility that you can win big. Until now, a lot of people have played slots, and others have tried to have a strategy to win them.