We're talking about numbers and facts. If your opinion is leading you to ignore evidence for the sake of your argument, ¯\_(ツ
_/¯s
Cool. Here are numbers and facts then. Blizzard claims, even with all the Internet cafe and alternate business model nonsense, that they have sold 30 million copies. Titanfall claimed 10 million copies. If Blizzard only sold half of what they said, they are still selling 15 million copies which is more than impressive enough on its own and more than.
I don't actually see what the issue is, why we are comparing two random unrelated games being sold, or why the burden of proof isn't on the person making some sort of claim though.
Edit: More than that, the subreddit is the 2nd largest non-default gaming subreddit, Overwatch esports have been televised, it continues to hover near the top of Asian popularity polls, it's the sixth most popular game on Twitch in terms of hours viewed, etc etc. The idea that Overwatch is an overwhelming success isn't really insane and, honestly, it comes off as pretty dumb to pretend it hasn't been regardless of whether you think the game deserves it or not.