If you continuously lose in noob games, then you certainly aren't ready for mid - expert games. That's why you get kicked from them. They're doing everyone a courtesy by kicking you. They just want to get a decent game in, and in this game, one person can ruin it for a team if everyone else is the same ranking.
Once you learn the ropes, a noob game can easily be swayed by one good person on a team. That's how everyone else advanced up. You can't just expect to be awesome right off the bat in comparison to people who have been playing for a long time. If you ARE, you will develop a high % from winning noob games and be allowed into games with people who have better stats.
Realize it works the other way as well. I can't get into any noob games with my stats. It's hard for me to find games sometimes because my stats are high and people don't want to play against me. But there are games for people in all areas.
Unfortunately, people just can't accept that they aren't amazing if they dominated single player hard and are amazing at RTS games. Had someone recently tell me this with his 5 game 40% stats. I explained the above to him, but he said "just give me a shot. I'll beat you in a 1v1 if that's what it takes", soo I 1v1'd him and it was just like beating an AI. I tried to offer tips throughout the game, but he never responded. I offered to play him again to help him out but he logged off shortly after. >.<
