Invincible is my most played MJ album so yes to me it's definitely as good as any of his others. In fact out of my iTunes top 20 most played Michael songs 8 of them are from Invincible (DWA, Cry, 2,000 Watts, Threatened, Privacy, Speechless, Whatever Happens, YAML).
When I first started listening to Michael I obviously just started with "the hits" (Billie Jean, Bad, Black or White ect) and after I'd exhausted them to the point even my mum & dad knew them all word for word 'cos I was playing them that often (lol) I bought Invincible and felt it was such a unique album; it was different to the songs I knew of his but somehow still definitive Mike.
I feel like I've really grown up with Invincible and changes in my life have been reflected in which songs I've called my favorite since first listening to it at 15.
Privacy was my favorite at the beginning 'cos it was 03 when I bought the album just as all the fall out from the Bashir interview was going on and Mike was been hounded in the papers.
It was shorty after that that I had my first girlfriend so songs like Speechless & You are my life quickly became my favorites then as that relationship ended I gravitated towards songs like Whatever Happens and Don't Walk Away (which has been my favourite song ever since).
Awesome album, for me on a personal level it doesn't get any better