FTR I like "Innvervisions" and "Fulfillingness'" more than "My Mind". But I mostly prefer the latter to the other 2 albums I mentioned because I honestly think it's more consistent even if it doesn't necessarily reach the same heights.
"Talking Book" is a bit ballad heavy for my taste (only actual funk tracks are "Superstition" and "Maybe Your Baby") and TBH some of those ballads aren't particularly memorable. And "Key of Life" has tons of great stuff but also gets pretty cheesy at times and definitely suffers from double album syndrome.
"My Mind" also has what I call the "joy of discovery factor". It's the first album in Stevie's 70's funk vein and you can hear how much fun he's having (is apparent as early as him talking about riding a camel on the opening track). I'm a sucker for those types of stylistic breakthrough albums- "Brining It All Back Home" and "Beggar's Banquet" are other obvious examples.
The early krautrock scene was fairly incestuous so I think it's less of an issue of Faust "ripping off" Can and more having similar influences (especially Velvet Underground- one of the biggest influences on krautrock along with Floyd and Zappa) and a similar musical philosophy. I don't really think the repetitive track on "Faust Tapes" is a rip off of "We Did It Again" either but I'm sure those krautrock bands were also Soft Machine fans.