Dean Ayala has shared quite a bit of historical Hearthstone data with the community this afternoon, giving us a look at Hearthstone's various past metas 1-2 months after an expansion release.
Quote From Dean Ayala A History of Meta Snapshots:
Been doing some research on how diversity/balance affect player population over time and had some fun reminiscing over past metas.
All data represents 1-2 months post-launch of relevant set. Generally, the meta that lasted the longest during that expansion.
We've got all the pie charts he provided in his tweets down below. We've organized them from newest to oldest expansions with the class breakdown first followed by the archetypes.
Fractured in Alterac Valley

United in Stormwind

Forged in the Barrens

Madness at the Darkmoon Faire

Scholomance Academy

Ashes of Outland

Descent of Dragons

Saviors of Uldum

Rise of Shadows

Rastakhan's Rumble

The Boomsday Project

The Witchwood

Kobolds & Catacombs

Knights of the Frozen Throne

Journey to Un'Goro

Mean Streets of Gadgetzan

One Night in Karazhan

Whispers of the Old Gods

Comments
I cannot believe Un'goro had the most class variety. I was still pretty noobish at the time, but I mostly remember Pirate Warrior, Quest Rogue, and lots and lots of Vicious Fledglings.
Wow, that's a lot of Druids back in KotFT!
Golden days of infinite Jades, Spreading Plague and Ultimate Infestation 🤣
Oh the nostalgia of when Tom went against conventional logic to hold a UI in his opening hand and it won him a World Championship!