What petesahooligan said is nothing more than pure true! I played the game myself, and won every gold medal, i entered top15 :D but not for many time... The only time i used missile machinery was the last level, Total Destruction \m/ , I dont remember the amount of cash left, but it was very big! Most of the game I used Chopper and commando to go where the chopper can't go, i remember that i used the grenade man once, the metro mission... Then chopper and comando...
A bit more of strategy would be AWESOME, no need better engine, no need better source, only more strategy :)
 "ShellShock Live"){kind=icon}
 "City Siege"){kind=icon}