You can't really compare Off The Wall and Invincible, as Off The Wall is a far more superior album with much stronger songs and a more confident and powerful Michael Jackson, who was ready the shake up the music world.
Invincible is an over produced album and less confident Michael Jackson. My reasons for saying a less confident Michael Jackson are, that Michael Jackson did too much songwriting/composing collaboration. Michael sounds like a guest on his own album, who doesn't know musically what direction to take.
Overall Invincible is Michael Jackson in transistion, not to sure if he should or should move away from the Michael Jackson sound of 1979-1997. Every artist has there crossroads album, and Invincible is Michael's. I apart from the fact Invincible is over produced, it's still a good album with a number of hidden classics. I'd say Invincible is a real "fans" album. If your a true Michael Jackson fan, you will know and love some of the songs on Invincible.
I think if Heaven Can Wait or Break of Dawn were released as singles with new music videos they would be No.1 songs on the charts.