His rebalancing of Street Fighter 2 HD Remix is received as a mixed bag in the pro community, but that is to be expected when you want to "improve" a game that has been a tournament staple for decades.
It also takes balls to create a spin-off of Chess to bring fresh air to the rather stale meta-game of Chess... and actually call it Chess 2, as if it would be the now-definitive version of Chess.
The nadir of the polarisation is his book "Playing to Win", though. It has some interesting points, but self-proclaimed "Sirlinites" tend to pretend they know everything about how games should be played, which is annoying. I mean, the fact that competitive Smash Bros. is so artificially constructed and is still beloved proves that Playing to Win isn't a great guideline for gaming, which practically advocates "play by the games' rules (not your own imaginary ones, like "throwing is cheap") and you owe your opponent to give it your best".