can it be worse than dota 2?
I have around 2.6k hours of dota and Overwatch is way worse with regards to toxicity. It seems counter intuitive because dota games on average are so much longer, you would think being stuck with assholes for 40 minutes to an hour is much worse. But what happens is, is in Overwatch you just get a constant barrage of assholes over several games in the same amount of time. In a long dota game you can sometimes build a connection with your assholes. You or them make a nice play for example and give each other a "well played."
While friendliness is not likely to develop, something resembling a grudging respect or tolerance would form. In Overwatch the chapped booty buns often begins in the spawn room and the game is over when the rage gasm is at its height. Then the cycle starts anew. There's lots of reason why Overwatch is a toxic mess but the cliff notes version is that it's
1. Overly team dependent.
2. Obscures critical information that let's players make informed decisions (i.e. no scoreboard)
3. Extremely contradictory design goals between fluff and mechanics that don't work. You are ostensibly suppose to swap heroes and treat them almost as callously as you would treat a gun in an fps. A mere tool. But everything about the game's marketing, lore, movies, skins, and so on is designed so people identify and fall in love with characters...some of which you can't play without getting screamed at by the aforementioned assholes.
As far as another game that quickly collapsed into a toxic soup:
Monday Night Combat--specifically the PC version.
MNC was so promising but the developer failed to do anything about the trolls flaming people or do something about the severe balance problems the game had. It was a third person arena shooter moba where you killed bots and enemy players for cash to "level up" your skills and eventually push the lane hard enough where your bots could disable the enemy team's moneyball. Killing the moneyball was essentially like destroying the enemy ancient in Dota. MNC had a huge issue with the sniper class. On XBOX it wasn't that great but on the PC with mouse and keyboard it was truly ridiculous
https://www.youtube.com/watch?v=xwvc7zmcN8g
This dude, a guy named "Hentai Tentacle Rape," and another named VVVVVVV were everywhere and probably scared away hundreds of people. MNC sniper used a semi automatic rifle that could one hit KO the entire cast with no charge up time. The fat reticle was meaningless since tryhards just put a blue tac on their monitor so they could quickscope quickly and accurately. This was one of the few times I went on the official forums for any game and I BEGGED them to do something about it and had to deal with all the goofy ass sniper pickers talking about their "skillcap."
The game also had the saltiest person I've ever seen in a game: LLama. After all these years I still remember this dude. The only person I've seen to get mad no matter what happened. If he won he got mad. If he lost he got mad. He played the MNC equivalent of genji and spent half the match saying the most vile shit imaginable in chat while afk in a corner somewhere. Every time the matcher searched I would clench my ass in anticipation this turd would be in my game. There were other dirtbags as well but this guy was the only one I remembered by name. They all scared away players.
Between these two things a promising game that could have been a smash hit was strangled in its crib. It came out at the perfect time during a major dry spell in TF2 updates when people were hungry for something different.