That "Check Your Head" was a sales flop I didn't know; maybe it's true, but it seems strange to me since "Watcha Want" was in Heavy Rotation on Videomusic, "Jimmy James" was played all the time, and "In 3's" was even featured by Red Ronnie, with the album making it onto Maurizio Seimandi's chart. It might not have made a billion dollars, but it definitely made a few million; if something reached Italy, it had at least made a million in the USA. At least, I mean, lightly.
"Get It Together" wasn't "a single," as it didn't have a video. It was a 12-inch because - and I actually don't understand why you don't highlight something so absurd - it's the only time a real MC (because the first person who tells me that the Beastie Boys are good MCs, I'll fry their boiler and demolish their chimney) appears on a Beastie Boys record. The whole issue stemmed from a kind of general "dissing" that New York had with those three, who were being marketed as "rappers" by TV, but they weren't rappers (nor did they want to be 100%).
In fact, the album was released with "Sabotage" - at least a couple of months before the world release - just to annoy and get people talking, eventually pairing the world release with the release of "Sure Shot," probably the best Rap track by the BBs.
This is the most Rap album of the three, and - back to the point - the 12" of "GIT" features the remixes from what could be called the emerging new school of Rap in New York, which went down in history as the "marpionata" of the three Jews to continue selling on their reputation as rappers, without getting dissed or shot by anyone. "Root Down," the same deal: a blatant ass-kissing. At the time of the images shown in the video, the three Jews were off punking in a kibbutz; the video showcases things that don't belong to them at all.
That said, the album is wonderful, and if someone listens to the BBs for the rhymes, they're an idiot.
You didn't understand the "Rap Metal" and "Nu Metal" issue; I don't know where you read that one became the other, but that's not the case at all. The term "Nu Metal" started being used when groups of metalheads dressed street (and thus Rap) but had nothing to do with Rap. Moreover, in Nu, there were no guitar solos, and the sound had much lower frequencies and far fewer highs. Zero "cutting" sound, No Fulmicotone, No Tupa-Tupa behind the drums. To give you a "strange" example, in many magazines of the time, Tool was classified as Nu Metal, especially because of tracks like "Disgustipated," but mainly because of Danny Carey's tank tops.
If you have to write reviews by reading from the internet, do it on albums too old for the users of DeBaser. You didn't understand a thing, no offense :-)
