Serious question how are they balancing the matchmaking lobbies

https://preview.redd.it/cjra0gsrflhe1.png?width=2359&format=png&auto=webp&s=eaf9125cb5d3da78c73104ad7c4e32bdd95412e9

https://preview.redd.it/vy37fks2glhe1.png?width=1871&format=png&auto=webp&s=bb218cc63266ad10d5f9b58c667a65c5ccab8ee6

This has been the 8th or so casual match in a row where I've been on a team that is obviously miss matched in terms of ELO or my team clearly has more newer players, like 3 to 1. how is this engaging, it's off-putting. I know it's coming off as soap boxing, but I really want to know how they match us up in casuals because it's not working, and it's really putting me off playing further.