Dropships - We could make an entire forum dedicated to this vehicle and it's... "clever" use. I'll only state my opinion on how it should operate. Design it to take way more damage when landing hard. Design it so that when it hits a soft target (personnel) it does moderate damage to them, not instant death and also damages the dropship itself.
Tanks - Limit the maximum occupancy to two seats. Maybe three for the most expensive tank. Slow down the refire rate of the missiles, both secondary and primary seats. For a weapon they one hit kills they fire way, way too fast.
Turrets - Need to rotate much, much slower. I'm fine with the instant death they can deliver, but it's insane
Grenades - Add an indicator, or a sound, or a light of some sort. I have a 46 inch LCD and often can't notice these things. They come at you too fast, and if you are in a fire fight with someone else, it's pointless trying to look for these things. If they still have tracer rounds 21,000 years from now, they should have a blinking light/sound/something to let me know it's there.

I know this takes place 21,000 years into the future and I'm sure by then vehicles/weapons as crazy as these will surely exist (crazier in fact) but keep in mind this isn't a real war. This is a video game in its beta phase and it has very apparent balance issues. You can explain all day why the dropship should kill people by touching them but just take a step back and realize how non-sportsman like and untalented that is. Now I'm sure you want to chime in and state how "It's a war! It isn't about sportsmanship"/"In war anything goes"/"All is fair in love and war", but look three lines up and notice how I already stated this isn't a real war.