Matching players with evenly matched players is one of the main reasons for ladder play. This is not without its merits, but it also isn’t a strictly good thing. If you match people precisely then there is no sense of progress because players will win about half their games regardless of how good they get.
I think this is definitely frustrating, basically everyone always just wins about half of their games. I understand why the ladder exists in games and especially Arena, but I think it just got to a point for me where its not fun anymore. You're only ever playing people at your exact ability level. The variety of opponents makes it more fun I think.