Quote from SilverchildRatings are important, IMO. I mean, how do you measure your progress if you have no idea on how you are doing?
They could do leagues like SC2 (and the matchmaking system is already there, and owned by blizzard too!) bronze/silver/gold, etc. It would at least be something. I believe Jay talked about "pvp level" in an interview.. that is pretty worthless. You know that eventually everyone is going to max it, then what?
Sure, you want to have ratings to tell how strong you are. However, why must those ratings be public at all? Knowing your own ranking should be able to be enough to let you know how well you're doing. You don't need to know that you are better or worse then the random guy ya joined.