This game is awesome. If you are one of those action shooting game enthusiasts, you HAVE to try this game.
SOCOM 3 has everything you could ask for : stealth, action, teamwork. You can give your 3 other teammates orders such as "fire at will" "hold fire" you can even send your teammates to positions to have a tactical advantage over your opponents. The single player campaign has many different objectives such as destroying missile launchers to taking out tanks using an air strike. you can approach an objective with guns blazing away or you can pick off your enemies with a silenced sniper rifle and a high powered scope. Either way, you WILL have fun.
Now the single player campaign is awesome, but the online multiplayer is a totally different thing. you can unlock characters and a ghillie suit to blend in better with your surroundings. Against real people, it is a huge challenge to yourself. If you just run up to an enemy and fire, a sniper will probably take you down. It is very fun and challenging and you can also get in humvees, tanks and even more vehicles with mounted machine guns and turrets.
So to sum it all up, If your the kind of person who likes third person shooters with lots of stealth, action, tactics, powerful tanks, armored cars and total customization, then this is the game for you