So-so. One of the pluses is that it's a bit darker and more realistic than, say, Hikaru no Go. There wasn't a single bad soul in HnG, but in SnO there's a lot of rotten swine doing rotten things. The bad part is a lot of the story is just dumb - the whole murder focus is almost unrelated to Shion getting better. Ugly designs as well for some parts.
It's less game focused but the characters are less likeable. The reverse trap is great, Shion is alright, the stuck up high school girl is bleh. The Meijin, his brother, and Itoshiki the lackey are cool too.
tl;dr - LOL DEEN