I've had pretty rock-solid performance with no glitches or crashes or any of the other issues a lot of people have been having on the Steam forums. The reviews paint a very bleak picture, and while this could have received a few more optimisation passes prior to release, I'm confident Koei will give it a few patches and iron out the stability wonkiness.
Snagged primarily to support Koei's further interest in releasing games on PC. Can't wait for Nobunaga's Ambition, and ultimately, if things go well, getting that Vita version localised.