That's as even-handed a critical viewpoint as you are going to get.
Yes, lots of it was crap and very little of the musical output was worthy of the seriousness with which it was approached by its creators* but you have to respect the sheer scope of the ambition and the lack of me-me-me singer songwriter pablum.
For the doubters look at it this way.
Without the musical and economic climate produced by Prog then there's probably none of these ....
"Nadir's Big Chance"
Magma's MDK
"Stormcock"
John Martyn's echoplex guitar
"Correct Use oF Soap"
Fripp's "Exposure"
"Liege & Lief"
Stereolab
Spiritualized
"Jehovahkill"
"Sons & Fascination"
"Tago Mago"
"Bat Chain Puller"
PIL
Radiohead
Eno's Ambient releases
Kate Bush
Thomas Koppel's piano music
"Low"
"Yellow Shark"
Nonesuch
and that's just off the top of my head. Not a bad legacy even if Prog itself makes you want to choke on your snakebite.
(* you can say the exact same thing about any genre that is serious about pushing the frontiers)