I heard the song a couple of times. A few impressions:
-the music is less clunky than the other "mechanical" songs on Invincible. The instrumental is more sparse, and each element has more room to breathe than on tracks like Heartbreaker or Invincible. I personally enjoyed that aspect of it very much.
-This is pure speculation, but to me, it sounds like this song was recorded early in the Jerkins sessions because it contains ideas that other songs, like Invincible and Privacy, were based on. I generally find the Jerkins sessions uninspired... so if my theory is true and this is one of the early ones, I feel like they realized they created a couple of good hooks here and decided it's too many to waste on one song, and so redeveloped them into separate tracks and shelved this one.
-the vocal is EXTREMELY polished. I completely disagree with whoever said it's mumbled or incomplete. Michael clearly spent hours and hours working on every line and there are countless very precise and deliberate ad-libs. To me, again this is pure speculation on my part... but if this is an early Jerkins song it sounds like Michael wanted to impress Rodney and spent more time on this vocal than probably anything that ended up on the album.
-lyrics are a bit corny and it contrasts with the super-polished vocal
-the final hook in the song, which parts of have leaked, is very catchy and I'm surprised that it's one of the few elements that haven't been repurposed in other songs. I would say it's one of the catchiest melodies Michael recorded for Invincible. It just works so well!
All that said, the song is not particularly unique, and I would rate it about the same as something like Serious Effect. But it's a cool example of what Michael was trying to do, and I think it works better than Invincible or Privacy, and is certainly more enjoyable than the songs on Invincible MJ just phoned in (i.e. where he didn't even sing the background vocals).
Ultimately Get Your Weight Off Of Me is a bit of a creative dead end, but Michael clearly put A LOT of effort into, and that counts for something! I hope we all get to enjoy it soon.