For me, sbmm means a more relaxed game and less likely to find parties because I'm below average
Just because people are in a team it doesn't mean they are actually working as a team. 90% of what I hear when I'm in a team is people complaining about the other teams weapons and how many people they have just killed and almost everything except where the other team is, when to push the other team and when people are about to use supers (to collect the orbs). This applies to good players as well as just pvp scrubs like me