From a 4 man premade perspective

I know dynamic queue gets harped on a lot, and I am one of those players who does want solo queue back. However, I was wondering if anyone has seen what I have been seeing when you queue up with a 3-4 man premade. The only time I have been grouping is with some real life friends on an alternate account that is in silver 5. Actually all of our accounts are silver 5 and last night 4 of us joined up and played a game. Now I know your are thinking "aw that poor solo player matched with you guys". I get it.. I have been there and it is weird. But here is the thing. I personally am used to playing solo queue and therefore ping a lot. Most of my friends are the same way. I don't treat solo players different as I know what it is like to be a solo player.

Anyways, so last night the solo player on our team went mid. He then went on to feed their mid laner and sorta farm under turret but more or less just auto attacking minions and only getting cs every once in awhile. It was like a 40 min game and he had like 66 cs at the end of it..... The game was literally a 4v5 and we got rolled over at the end.

I have also played a lot of 3 man premade games and the same shit happens. We always get one completely new player while the enemy has 2 decent duo or solo players and an organized 3 man premade. While we have us, 1 player every game who I have no idea how they even level 30 and playing ranked and not negative lp in bronze 5 and then one ok to terrible player. I know my friend's mmr on most of their accounts are pretty bad and my alternate account has a pretty low mmr as well, but I just can't really stand playing with them anymore. I love playing with my friends and although I am pretty bad at this game my actual mmr is roughly a tier higher and I literally can't do anything to help us win most of the games. I know I personally have been carried by a few premade teams this year. Literally as the solo player just chill.... don't feed... and try to push objectives when possible and be there to save turrets. But our teammates are almost always brand new players who sometimes don't know how to cs and it really begs the question of why are we even playing in the first place.

Just curious if anyone else has been seeing this?

TL,DR As playing as a 3-4 man premade I have seen many players on my team be much less lower skill than the league they are supposed to be in. Have other premades been seeing the same thing?