Game Pass for Blizzard titles really doesn`t seem worth it.
Overwatch 2 will be free to play.
WoW seems to not be included in GP
Diablo is questionable at best.
If D4 will cost 60 dollars for it`s cheapest version, that amount is roughly equal to 5-6 months worth of GP.
It`s probably unlikely that they will ship the game`s first expansion half a year after it`s release. so you may end up paying more
for GP than you probably would by just purchasing the game by itself.
I didn`t see hearthstone mentioned, it could be interesting if GP included a few card packs each month, but it too seems unlikely.
Seems to mostly be of interest to anyone who wants to venture beyond Blizzard titles.