I’d been trying to get in since launch time on XSX, with zero luck. I just switched to the Asia server on PC and finished playing 3 matches without a single problem! (Thanks to whoever recommended it earlier in this thread or another). For those that want to try it on PC, just use the small globe icon on the Battle.net launcher to change your region. I was able to “queue” my account merge (I just had to verify the connection I already have for Xbox and PC). Other than that, it was completely smooth sailing… almost like a game launch from a multi-billion dollar corporation is supposed to go.
It looks like Blizzard is finally providing some real information about their issues: Overwatch 2 Known Issues - October 25, 2022. It’s clearly not [just] a DDoS issue… they’re got lots of architecture problems and are not communicating well.