Seriously if you're not rank 1,500'ish or better you just shouldn't be joining pro games. The ranking system isn't perfect, it's good enough.
Can't say I agree with you there. My ladder rank is somewhere above 20K but I wouldn't have any qualms with joining a 'pro' game.
I am sure mines pretty high 2 but I can play with any "pro"
U both have +50% W/L, thats a good indication, at least for me. Course there r exceptions.
And yes, Noobs join Pro games 100% of the time, really, 100%, if the host dont kick players theres gonna be a noob playing. I have hosted premade games at the topic and noobs joinned the game and didn't know whta "premade" meant, I had to explain, and still, they wanted to play against my premade.
Ps. I always let the "noob" partner to know about the noobish of his team8. If they want to be stomped, well, ok. What u gonna do, right?