Plus, I'm sure every single one of us have bought a game we ended up hating.

For many, its either 'you can't judge until you play' or 'if you bought a game' or 'you played it a bit/lot but still bash it you must like it' thing.
It is silly.
I don't need to buy Diablo 4 to know the game sucks. Ive seen enough videos, and what not, to know it sucks.