Deadly Dozen has its ups and downs, but its mostly a poor game with no content out of the obvious
Its so hard that you need all the time in the world to wait for the best moment, thats in the simulator mode, if you wish to play on arcade mode, it doesn't matter, just charge at an entire army taking bullets everywhere that you'll feel the same thing.
The game itself lacks of content, its basically the same thing, kill, capture, run, or something else thats not very important, but the fact is, the only difference its the number of soldiers patrolling the goal area and a few buildings or scenarios that doesn't change the main role.
What saves the game its the soldiers skills, each one of them must be chosen accordingly to the map and goals, wants to charge to a fortified barricade? Choose a heavy weapon guy, want to plant a bomb? Choose a bomber, stealth is your second name? Choose a sniper with the support of light weapons, that makes the game slightly different from one map to another, but thats not a major feature that could make the entire game more fun.