Flex queue:::: 5 man vs 3 solos and 1 duo– seriously?

I have played a lot of flex queue as a solo player this year, mostly because I enjoy beating my head against the wall expecting something to change for the better. The matchmaking is mostly one sided, the games are often decided by 15 minutes or earlier, I get camped on a regular basis as a mid, and I often have to deal with my own team that is doing their own thing together while I am trying to figure out what they are doing. I obviously can tolerate these things because I have played a lot of flex queue, but in the game I played last night I think that my tolerance for this queue has finally been met.

Game: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2575576689/218375179?tab=overview

I saw in the loading screen 4 names with the same club name, then I realized that 4 man queues are not allowed so it had to be a 5 man premade. After looking them up on Op.gg, it is confirmed.

Seriously, a 5 man premade vs 3 solos and a duo? Regardless of the MMR/ rank/ skill, this is just straight BS and I cannot understand how this is even allowed. FF@RITO PLS