It’s the prepatch – it is not SUPPOSED to be a good game. It is not SUPPOSED to be playable. It is not “early access to the game”. It is there for testing.
If you need “assurances” go visit a stockbroker or banker, who wears a suit, talks like your uncle, pats your hand and gives you assurances. Don’t play a video game. Blizzard’s job is not to give you “assurances”.