As someone who has been keeping up to date with the manga, Kakegurui was an anime I've been looking forward to this season. However, knowing that this is going to be a Netflix show made me pretty frustrated, but I went on to watch the show through other ways.
What do I think about Kakegurui? It's very faithful to the original source material. Kudos to MAPPA for getting much of what made the manga great, with the art and character expressions being accurate. Though not as interesting and suspenseful like other gambling anime, the show still keeps it entertaining throughout. Characters add so much emotion to the anime and basically carry it through predictably boring gambling scenes. This show is great gateway material and its good and exciting enough to hold up as one. Possibly the best OP of the season (and maybe the entire year), Kakegurui's OP is fantastic. It has so much symbolism and connection to the manga that it contests any JJBA anime openings. BGM isn't really something to write home about, but it does well to build up the tension and atmosphere. The ED might seem like fanservice at first, but there's a sort of hidden symbolism in it, representing the change of Yumeko as a character.
If you read the manga, you should definitely watch this. If you're coming in blind, I would recommend reading the manga first and watch it later (which you can actually do, since there's no legal way to watch it with english subs yet), since you won't be able to appreciate much of the what anime is doing right. Overall, if you're looking for an anime to watch this season, this definitely should be something that you need to consider.