Has promise
There are a few things which stop this game from being really fun. Namely the poor AI which directs the tanks. They seem like they randomly wander all over the place, even when given specific orders. Some times, my tank will circle a power up like there is some sort of force field around it. And even if the tanks do head off in the direction you want them to, they are too easily distracted by enemy tanks. If I give a tank a mission, unless it is attacked, I assume that my assigned task will be completed.
Things to help this game out
1) When created, tanks should queue up in a "holding pen" defending the base until given orders to move out. 2) When given an order, tanks should avoid obstacles, like rocks and trees, and take a direct route to the area assigned. 3) tanks ordered to attack should do so in the most direct manner. 4) There should be some tank option that's sole purpose is to collect powrer-ups and bring them back to the plant to be used in future tanks. 5) Minor grammar issues throughout the game should be fixed, but that's not really important.
I do like this game and it should be a 7 or an 8 with a few mods.