Sounds like maybe you already KNEW Calder was peripheral before you asked.
A peripheral Calder doesn't work for me, but I'm sure there are hundreds
of people in the world who agree with you and millions who never even
heard of him. You are in safe company.
So, OK, there are artworlds where Calder doesn't count, just as there are
worlds which discount Rembrandt or Picasso or Donatello.
I tend to think that once "the cat's out of the bag" there's not much
chance of getting it back in. Once someone's generally accepted as an
artist, like Calder you can argue respective merits; say, "Calder is less
inventive or challenging than Bueys." But, Turner is IN and Calder out? A
waste of breath maybe.... or maybe not... I just don't recall a headline
like: "Klein ruled NOT an artist! Artworld in shock! --details page 4."
I can't say Calder is a heavyweight, but compared to Turner, Nolde or
Leger? Please! :) It's fun to chat about tho. cheers...