Ignoring anything you might say about the game itself (i.e. it's not a good game at all), the biggest reason people are shitting on it is because Overwatch 1 was a $60 game that they abruptly canceled and re-released as Overwatch 2 "free to play" without any changes to the it, locked the characters behind a paywall, and leaned as heavily into micro-transactions as any game ever. It was a massive bait-and-switch. They also promised that a complex story mode pve experience was the reason they had to make it OW2 rather than an expansion or whatever to OW1, but they ended up canceling that... so literally all they did was take a game they had charged people $60 to play and made it an f2p micro-transaction game. They royally fucked over the loyal player base, and cheapened the game by making it free. I've never seen a more blatant "fuck you" from a developer to its fans ever.