You know how when movie trailers will edit a film to try and sell tickets? And when you buy that ticket to see the movie, it turns out to be different from how the trailer showed it? That's kind of like Kakegurui. It'll keep advertising itself as a gambling anime. And while it does contain gambling, I'd say the show is more about observing how people use (or misuse) power, or what exactly addiction can do to make people make the decisions they choose to make.
Take our protagonist, Yumeko Jabami. She becomes physically aroused by the thought of intense gambling, something that terrifies her opponents. Also take note of the School President, who views the school as her own personal fish tank. She introduced a caste system into this school revolved around gambling. Those aspects are what makes Kakegurui interesting.
The show is a blast to watch. It's not a masterpiece by any means, but gosh dang I had fun watching it. It's entertaining to watch seemingly innocent looking characters make batshit insane faces and lose themselves into gambling, whether it be for money, social status, their aspirations, or their very own life.
I would recommend it to people who want to easily sweep through 12 episodes of entertainment. But if you're looking for a hardcore gambling anime, this might be a pass for you. Personally, I thought it was fun.
