Re: Expressive Drumming, ever come across this?
Not every song needs drums played through the entire song, and some songs don't need drums at all. It's all good, and not that unusual.
Of course it may be unusual for Slipknot, and that may be precisely why they recorded it that way - to get the listener's attention. Or possibly to show that they can have a softer side. Either way, I don't think the sporadic drumming is an issue, it sounds right to me.