Tired of being matched with players on the other side of the world lagging everywhere and shots not registering, and getting killed around corners. If you restricted SBMM to regional players, these issues could be mitigated. Connection quality is so important. When connection is thrown out the window, skill means nothing.
Edit: I see some people equating skill base matchmaking to a fair fight. This couldn’t be farther from the truth for higher skilled players. In reality, the higher your skill, the less fair the game becomes. When the game has to cast a wider net to find players of equal skill the ping disparity increases. The higher the distance, the higher the ping. Because the game uses hybrid servers this creates an advantage for the hosting side. The farther the distance, the bigger the advantage for one side. This is why you often see games ending in mercies. Despite players being of similar skill, one side simply can’t do anything, while the other side can do no wrong.
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For me, UK, wired, business internet, PS4 2014 to 2020, Xbox series 2020- now, made zero difference if cbmm or sbmm, my lobbies where still heavily middle east, Russia, Asia, somehow crossplay made it worse & it's one of the main reasons I stopped playing.