This has just occurred to me, but the last BioWare game to set comfortably above a 90 Metacritic score is Mass Effect 3. Even Dragon Age: Inquisition with its GOTY awards and nominations never quite managed to go above ~85. Andromeda, meanwhile, is at 76 (at least for XBO) while Anthem is currently hovering around the low 60's. They have basically been on a downward trajectory since ME3.
For reference:
https://www.metacritic.com/game/xbox-360/mass-effect-3
https://www.metacritic.com/game/xbox-one/dragon-age-inquisition
https://www.metacritic.com/game/xbox-one/mass-effect-andromeda
https://www.metacritic.com/game/pc/anthem (PC version is the only one with a score so far)
If we were to count the average across all platforms, then you could say Mass Effect 2 was the last game that went well above 90.
For reference:
https://www.metacritic.com/game/xbox-360/mass-effect-3
https://www.metacritic.com/game/xbox-one/dragon-age-inquisition
https://www.metacritic.com/game/xbox-one/mass-effect-andromeda
https://www.metacritic.com/game/pc/anthem (PC version is the only one with a score so far)
If we were to count the average across all platforms, then you could say Mass Effect 2 was the last game that went well above 90.