[iMSystem]

Generally speaking your looking at bio focused play, where ghosts only really come into the end-game for nukes, as if your maxed on 200/200 and your opponent (who is going mech or some variation of biomech) is maxed as well, there is no way in hell you are going to trade efficiently to cause an attack.

Instead, this is where nukes come in handy, Nuke range I believe is 10(?) If you can get in and start nuking the siege lines of your opponent you will not only force him to un-siege and retreat, but also add an element of extra work to his list. (This is where you can get lucky with the nukes)

By forcing un-siege of his tanks, you can them go stim run in and deal more efficient damage (Still might not be worth it though, depending on what else he has lurking behind the initial few tanks :P)