I remember, back when the tiers for Lego Rock Band were posted, I thought "why is Kung Fu Fighting top-tier?".
Be careful what you ask, lest you get an answer you don't like. This ranks among the most annoying guitar charts I've ever played. You have a constant stream of funk-pattern chord/single note switches thrown at you that doesn't let up for a second, just slow enough and varied enough that altstrumming becomes a real pain. I squeezed by with three stars and ~75 percent on my sightread, and I have no intention of ever touching this thing on Expert guitar ever again. I'd seriously rather play through a three-song setlist consisting of Visions, Thrasher and Sex Machine than play Kung Fu Fighting again.
The song isn't bad (thank you, Captain Obvious), and the bass part is pretty good. But that guitar track I honestly can't recommend even to difficulty sticklers, because it's actually not that hard. It's just annoying as all get-out.