All their albums definitely have songs that aren't as good as the 'hits' and more well-known songs. BIB and HTH are obviously the 'big' albums, but I also think Dirty Deeds Done Dirt Cheap is one of their best albums, along with Ballbreaker, which I think is quite underrated. Their last album was very good too, I thought.
Checked my vinyl collection it is:
BlowUpYourVideo, near mint condition to.
I may have to re-investigate their back catalogue. These days I generally use spotify/last.fm for sampling/checking out bands unfortunately
AC/DC are anti all that stuff.