Having a good time with this one.
Im on the second series of missions so Im pretty early in the game. So far, its been a lot of fun with only a relatively low amount of grinding in order to earn enough money for upgrades (4 stars).
UPDATE: Now that I have completed the game, I can say its a lot of fun. So its worth throwing a few bucks the developers way for air strikes and nukes.
UPDATE: Shadow Strike was updated to add more missions. But the game is buggy. Often a level will not end after the mission is completed. The game tends to forget my progress in Bushwhacked.
IceCap about
Drone : Shadow Strike, v1.3.23