Wow, nice link! That cleared up a few things I was confused about. Even though your rating resets everyday I think it still takes into account your rating from past days. My guess is the very first ranked games you ever play it probably puts you in the middle of the pack so you can move up or down. So hopefully since you have a few games under your belt if you go into Arena again it will take that previous rating into account and start you off more where you are suppose to be.
Also somewhere in those matchmaking menus you can prioritize your game search based on skill.