I use Missile Artillery extensively in the first half of GE in my CE cities, only leaving them out when there are Attack Helicopters in the enemy's army. If there are no IFVs in the opposing army I will generally use 8 Missile Artillery, sometimes putting one AAV in there. If there are IFVs, I put in one Rogue for each IFV. I still occasionally take some minor damage, but always win. It does require manual fighting, though, as the AI will only move them forward enough to hit their main target, so there may not be any other enemy units in range to get hit with the extra shots, thereby wasting them and resulting in much more damage and usually a loss. You also generally don't want to use them against troops that have Rapid Deployment, although I sometimes do the Rogue matching with them like I do with IFVs. And you have to be a little careful with units that hide in forests, as they won't take damage from the extra shots. All in all, it would be maybe more efficient to use other units, but I like to use them for entertainment purposes. I don't find it much fun to just hit auto battle.