After playing the first pre-order beta, it seems to me like the Chaos have been unduly nerfed. Their weapons no longer vastly out-range other factions (like the Imperial Navy), and their weapons seem to be pretty lackluster in general. It will take a battleship several volleys of lances to destroy an escort, taking so long that the rest of the enemy fleet is already on top of you by the time you're done. They just need some damage increase for their long range weapons, which are their bread and butter.
Eldar Corsairs still seem very expensive for how much damage their ships put out and how fragile they are. I saw virtually no one playing as them during the beta, and I think this is why. Disappointing for us who love their play style so much! Some price reductions, and they should be good to go.
Also, the necrons star pulse is stupidly powerful and should be massively nerfed... but I think everyone is aware of that.
Thanks for the amazing game! Can't wait for the second beta!!!