I think it is actually pretty balanced right now but IMO the game could evolve from early to mid to late game better.
Ive been reading the NS 2 fourms and alot of people feel the balance is off for onos egg drops, and commander droping things ingeneral.
I think a better fix would be to try and make the progression from early to late game take longer, but taking out drops for weapons/lifeforms would do that alone and im not all against it I just feel drops should be balanced rather than taken out completely.
Make commander tech for it or make it cost double so the risk reward is greater and you *Edit*cant drop so many exo's/onos so quickly.
Balance is good IMO though so changes could be made like I think jetpacks should cost more to research and to buy and flame throwers should do more damge over time to aliens.