K, we all have had the Idea to boost personal rating by slaughtering team rating and beating the hell out of the horrible teams.. Well I have now refined the idea.
First, you need 1 player with access to 2 70s, and then another player (or 2, dont matter).
The first character needs to be naked when queueing, other player just has to be in your party. Since you can't solo queue anymore, just group queue while this player farms gold. Then you accept the queue when it pops, and they ignore it. (this is key)
So slaughter your team rating by being owned by 2 versus 1 arena games.
Then log on your second character (who you want to boost personal rating of) and group queue with your friend whom also wants to boost personal rating. You both accept queue when it pops, and play the low-ranked teams to boost personal rating. (shouldnt be too hard to not lose)
Now final step: repeat the solo-arena game step to re-lower your team rating, and then repeat the group arena games to continue to raise personal ratings of the other 2 players.
This should work for 3v3 and 5v5 also...
If this didn't make sense, reply and I'll try to explain better.