The positive/negative traits work fine as far as I'm concerned. It is the pick 2 choices that I believe are out of balance with some excellent picks and a lot of mehh choices
I agree there are some excellent ability picks. Strangely, other people think that my favorites are stupid and that their favorites are overpowered. And then I see more comments that those overpowered abilities are useless, there are some others that are better. As long as there is this much debate, I have to wonder if the developers haven't hit a good balance.