I don't think the game is that bad either but it seems there are a few design decisions that the player base doesn't like. Things like SBMM being really strict and there not being a ranked mode, stupidly loud footsteps, designing maps so players have "safe spaces".
Regular COD players just aren't happy and they've been asking the devs to change things and the devs have refused to do anything. So players are just ditching the game. The exact same thing happened with WW2 and things only got changed when they got rid of the studio heads, but it was too late.