We can absolutely NOT know if the final product will be well balanced. As previously stated, with the current roster of 6 I can say I find these characters good to go! I've only tried Big Daddy and Jak&Daxter for a few minutes at EBGames so I won't even put down my opinion on those two.
I like the message you are trying to send, but no amount of "get good" will stop me from beleiveing Kratos gains AP too quickly. I win an overwhelming majority of my matches in both FFA and 2v2. Having played as Kratos, and having played all the available characters against Kratos, it's blatantly obvious the likelihood of his character build grants him an AP rate higher than any other character.