^^
I wouldn't compare a Jacksons' album to MJ's solo album, but I actually prefer Off The Wall as an album to Thriller though Thriller has songs with more amazing vids...
(Maybe I'm just weird)
I did know that Rolling Stone's readers poll has had interesting opinions on Michael's work even though I'm not sure about the year. I don't know when they had their 1987 election, but Bad was definitely promoted already in 1987, there were single releases, videos and stuff, so it seems to me that those Rolling Stone readers had their negative opinion on the album despite the promotion.
I believe I've seen some other magazine (or maybe it was Rolling Stone again, I'm not sure) having similar poll results even after 1988, the year you couldn't possibly claim there was no promotion for Michael or his album or his book or his film. Wasn't Bad among the biggest selling albums (in US) both in 1987 and 1988? So I don't consider such poll results very significant and don't think they occured due to not enough promotion even in 1987.