It isn't a question of level Ext. MMR probably correlates with two things pretty strongly. (1) Natural playing ability (which in GoI includes forgivable things like poor twitch reflexes, and less forgivable things like an unwillingness to build consensus or listen) and (2) Experience. Matchmaker tries to balance MMR, if you win a lot, as many experienced players do, then matchmaker will on average give you inexperienced allies, and it will give you naturally bad allies as it tries to balance the match. If it is having a hard time balancing the match, as it often does, it will give you both. That is to say it will pair you with the worst player it can find. Might be the worst because they are a bit slow on the uptake and have the reflexes of a drunk sloth, but are nice folks to have on board, or they might be the worst because they spend the entire lobby screaming into their mic 'ready up' and questioning the sexual interests of the rest of the lobby while you are trying to get them to bring heavy clip. If there is someone who is both in the queue then your 45 ass is likely getting them unless there is a stack better than you in the queue.
The problem being identified here isn't being paired with low level players, it is being paired with especially bad players; often those players are bad at GoI because they are, at best, uncommunicative, at worse, total asshats.
Without the secret sauce we cant say for certain but I share the observation given. If I get the crap kicked out of me in the SCS or have a run of games where I play without some of my regular crews then the novices the matchmaker throws my way suddenly get far more polite, at least until my MMR recovers. In terms of putting my money where my mouth is, you'll notice I tend to stick about in lobbies when one of the ships is a full Rydr stack, even with a low level ally. These are often some of the best experiences I have in GoI because you folks win more than I do and thus tend to act as asshat magnets.