Decent. The best thing about this anime is the art style, soundtrack, and that some characters are interesting. But as a gambling anime, it's pretty mediocre. Tries to be gorey and deep too but it feels misplaced. If I had to describe Kakegurui in a sentence, it will be: Another anime with loads of fan service, oh and there's some plot and it's about gambling addictions apparently.
If you're looking for intense character building and plot driven stories, look elsewhere. There's many hidden gems.
If you like teen thighs and some aspects of gambling tension, it's a good anime to pass your time.