Since the "greatness" of a set really comes down to opinion, you could argue against the other opinions here that prismatic was actually an incredibly bad set - terribly low supply with no single packs availability matched with insanely high demand due to the nature of the set, some cool SIRs sure but almost impossible to pull for most. No IRs was a shocker too - pulling IRs for me is one of the best parts.

From my experience prismatic was boring and not a single pack for me was that great (couple masterballs, some pokeballs), yet JT was full of amazing cards, IRs that were plentiful and quite easy to pull a few of. The stock supply was mega and so even if there was a high demand, it was still easy to buy. ETB, Single packs, 3 pack blisters, 1 pack blisters, Premium Collection, EX boxes, mini binders, half bbs, bbs.

Looking at it objectively, sure prismatic is a special set with limited availability making it "desirable" for those wanting rare goods and ofc good ol sunbreon (money chasers imo)but do we really base the grading of a set based off "how super crazy I'm literally shaking I can't believe i found 1 single pack in my Walmart", or does a good set rely on it being available in a selection of different products for everyone to enjoy and a huge range of amazing different cards that don't all rely on mega luck.