Guild Wars 2

So, I got plat after my 10 games, then I won 2 games and lose the rest

Regardless, when I am in gold, I had some games where opponent apparently said they are in upper plat, close to legend while my team are are golds. How that even works?

https://wiki.guildwars2.com/wiki/PvP_Matchmaking_Algorithm

also, look for threads with a red icon to the left here, where the PvP developers actually respond.

ultimately, though, it works because GW2 tries hard to provide good matches with equal MMR, but will allow greater degrees of difference if needed to keep the queue “fast enough”.

Which it sounds like you are in — though the good news is that if you are ranked below the team, you are probably not expected to win, so consequently won’t lose a great deal of MMR from an expected loss…

So you saying skill rating is not equivalent to mmr?

No, what’s being said is that the matchmaker will make bad matches to keep the average queue time low.