OKay this is just... No,
 

OKay so my last two games on TT were... My team lvls 22 23 18 vs 18 30 30

My other game was my team lvls, 22 7 19 vs 21 30 30

Why is matchmakert so bad?

lol
at least you get to play vs level 30s

It's based off of normal elo. That and the fact that I don't think many people queue 3's that often, sadly enough ._.

The matchmaker leaves something to be desired at the best of times, but with the lower 3's population, it's job is even harder. If you get matched against a higher level team, suck it up and do your best. And most importantly, learn. (oh, and have fun, but yeah, learn)

Maybe there is a silent elo for non ranked, and you're just good?

Yeah sometimes it sucks. Im lvl 30 and had a lvl 11 and 7 on my team against a 30, 28, 29. Totally sucked.