Kakegurui is, in simple terms, extremely overhyped. The story is boring and the characters are mediocre. Despite the school setting, no actual learning takes place, and only gambling is shown all throughout each episode. The school has an immoral hierarchy system too, but as everyone gambles, no one really cares for it, and instead supports the notion except for a select few. In a world where gambling is everything, if you suck at it, you become the lowest of the low -- a housepet.
Jabami Yumeko is a new transfer student who is introduced as a gambling maniac. She does not gamble to get money, but rather due to the fact she is addicted to the concept of gambling instead. She loves it when her opponent makes her have a hard time, but of course, she ends up beating eveery single one of them no matter what. She is a genius at reading everyone's tactics and cheap tricks. Although that's supposed to make it cool, it just decreases the tension and cool factor. The Student Council members are extremely weak and worth nothing in comparison to Yumeko, yet they are considered the best gammblers in the whole school. Once their tricks are revealed by Yumeko, it is just Yumeko storytelling and not the animators actually showing how exactly she could have figured all of that out, and leaves viewers to imagine the links themselves. That is just lazy work, and the tricks become even more boring and stupid. It's basically child's play.
Kakegurui failed at highlighting Yumeko's intelligence (they only scraped the surface of it) and a psychological meaning behind her addiction towards gambling. It's just filled with hot girls, some flashing and rather disturbing faces whenever they get 'turned on' from gambling.
One of the most disturbing scenes ever would be when the president of the beautification club or whatever the fuck it's supposed to be, Ikishima Midari, got turned on from Yumeko blatantly calling her disgusting and the absolute lowest of the low. She fucking drooled and squirted on the floor, like what the fuck is wrong with you? The words she said were also very disturbing, saying shit like how Yumeko's her goddess and all the others just feel like normal masturbations. What the fuck is that supposed to mean? She aggravated me so much. The ultimate masochist, I think. God. I hate her.
It would've been way better if they delved more into the psychological (and possibly political) theme. Yumeko is a certified psycho after all, and all the other students have issues too. It also makes zero sense to me how the students would even want to continue going to school there if they were already in debt and gambling's clearly unhealthy. This was a rather poor attempt at a dystopian-esque world.
Kakegurui is my first gambling anime, so I don't really have anything else to compare it with, but I know a lackluster anime when I see one.