I had an early W&W, it said "Mastered by Sanyo" on the inner part of the disc, which explains everything!
Completely agreed. ANYTHING back then by Sanyo was dreadful!
For initial CD releases back in the 80s, the most underwhelming I ever heard were: the aforementioned W&W, "Machine Head" (Deep Purple), and "In The Court Of The Crimson King" (King Crimson, obviously). The source tape noise just drowned out most of the music - absolutely horrific mastering for CD, esp. the last two.