Maybe too much power? Look at the advantages of these...they don't cost any resources, cheap and build fast, good range, pack a powerful punch on units or cities, can be rebased to ANY city in range! Sure, they are a fire and die weapon but you can build another one in just one turn. On quick game speed, I was building these things in just 1-2 turns in most cities and rebasing them to one central city. Then I would bomb enemy cities down with B17 bombers and level it with a GM. After this, walk the boys on in. Then when the enemy would attempt to counter attack, I would launch more bombers and GMs and hit their ground units. I prefer this to moving around slow artillery pieces with several units to surround a city to take it. I was using only 2 Mech Inf to walk in and take the cities. Then these GMs can be carried aboard a Cruiser or Submarine! I AM SOLD I don't remember using these missiles much in Civ4, hardly ever so I guess they must have not been near as good. Sure bombers are great but they do cost oil and more then double the cost of a GM. Perhaps they are not too powerful in Civ5, but maybe just too cheap? So next time you go on an offensive in the later era, try a bomber/GM combination and you might can see some great results too.