I stopped playing this game almost year ago. So here is what i see after playing 1 game after come back.
1. Banisher, unit from Tank Lab, now useless. If you want some power against light units you better take 2 panthers for same price - do same as banisher, but has speed and quantity. Before Banisher had range and damage, it was powerful but slow unit - true representative of tank lab. Now its just weak and slow unit.
2. Vamp. You nerfed its speed and damage? It cant kill cheap little dinky Swift, without it able to escape even not using d-boost. Add slow damage to Vamp's weapons, or buff its speed and damage.
3. Firewalker. Its OP. Its not like anyone never used it before, when it was just 2 fireballs. No, it was pretty popular unit back in days. Dont know why you needed to buff it into mini-catapult.
4. Placeholder. Just OP new unit. Increase its reload time so 1 placeholder does not lock commanders.
5. Laser weapons(HLT, Grizzly, Anni, etc.) Still makes this game like its from 80s. I mean, this laser mechanic when continuous laser fire everything in one point. Same laser mechanic was in old game Mechwarrioir4, then in modern successors laser became more like laser - be able to aim while firing. So in Zero-K make laser weapons instant single powerful pulse, or make it able to aim while firing.