My rule of thumb is whatever vehicle you buy, if you dont kill double the cost of that vehicle you wasted that vehicle and hurt the team. And stealths get chewed up when they are up against more than one vehicle. And sorry guys you can see stealths very clear when there is alot of lead flying.

Same goes for gdi, Mammoths need support, and unless you have 1 or 2 engis willing to repair you your gonna get chewed up quick and waste the 1500 when you could have bought 2 mediums that would have done more damage. I love when I see a mammoth coming in the distance without engi support. By the time he gets within range to shoot me back I already have him almost into the red.