If my information is correct, Rumble used to use connection-based matchmaking, but then switched to skill-based matchmaking at some point in D2's lifetime. This makes sense.
However, I can't seem to find a game where it would be working properly, unless my idea of a skill-based system is horribly wrong.
While I understand that one's Glory rank is not the singular factor in determining one's skill, I feel like it is a pretty good indicator of it. Now, I myself have never reached max Legend rank, with my highest Glory ever being about 4000. So, if skill-based matchmaking is working correctly, then how does it decide to match me with at least 1 person who is [i]Unbroken[/i] in basically all the Rumble games I play? I can't even exaggerate this. Maybe in 1 out of every 30 matches played I get a game without any [i]Unbroken[/i] people. I believe this started around Shadowkeep's release, and in general the Crucible has been less of a fun experience. I'm perfectly okay with getting second place, but not if second and first place has a 6+ point difference between them. I just don't see how this ends up being a fair match.
EDIT: Case in point, the 3 Unbroken people in my current Rumble game.
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Bungie just use it as an excuse to match people in the uk with Mexicans and japs from my experience