I didn't enjoy it one bit. Besides looking ugly, the puzzles were pretty glossed over at times and I really just couldn't wrap my head around puzzles being used to kill people.
I mean a children's card game is plausible but I guess my line is god damn puzzles.
Now for me, I'm attracted to shows in which the entire world revolves around a very specific and bizarre conceit. I guess I'm broken from watching so much Yu-Gi-Oh, but the idea of puzzles being SERIOUS BUSINESS and the vaguely YGO-esque eXxTrE3Me hair give me the sense that I'm probably predisposed to finding the bullshit entertaining and campy instead of bad. I trust your opinion, but now I kind of want to see if my experience matches up with yours.
Oh, and it's also directed by mai husbando SatoJun.