Performance-based Matchmaking
Blizzard fixing excessive negative rating adjustments in Heroes
The 2018 Gameplay Update released for Heroes of the Storm in mid-December introduced changes to matchmaking -- notably, it introduced peformance-based matchmaking.
Stealth changes and more hit the Heroes of the Storm PTR with 2018 Gameplay Update
Back at BlizzCon, Heroes of the Storm outlined its 2018 Gameplay Update patch, and today, that patch has arrived on the PTR.