I kind of wonder what allowed Bat Out of Hell to become such a huge thing.
The fact that it's fucking awesome.
This guy gets it. Ok, so I'm not sure why the OP wants to exclude the Greatest Hits or Soundtracks? As Stads said, it's easier to include what I haven't listened to:
The Bodyguard (though, I may have heard it once back when it was released)
Dangerous
21
The Immaculate Collection - I'm going to give myself a pass here ... I may not have listened to this album, but I've heard all the songs.
Let's Talk About Love
1
Titanic
Nevermind
Supernatural
So, overall I'm at 24 / 32. Otherwise, I'm at 18 / 24.