Stealth action...it isn't Metal Gear, but it is the next best...
Being a super spy, Sam has a lot of gadgets under his belt, such as a lockpick, which will be important to your success, vast amounts of weaponry, and of course other cool stuff.
Some of your most important gadgets are your goggles, you have the ability to use both night vision and heat vision goggles. Being able to see in the dark is important, because it is important for Sam to remain unseen, and that is the best way to do it. Also, heat vision goggles allow you to see things that give off a heat signature, such as people and bombs, and they will be needed in certain situations.
As said in the above, it is important to remain in the dark, because as long as it is dark enough, enemies can walk right next to Sam, and as long as they don't touch him, you will go unnoticed, and that is important to the success of the mission, and being a spy, Sam has many ways to deal with foes so they will no longer bother you.
Along with a vast array of gadgets comes a vast array of weapons. Sam always has a silenced pistol with him, and usually carries a silenced assault rifle type weapon which can shoot out secondary weapons such as shockers that incapacitate the target, of airfoil rings which render enemies unconcious.
Like I said, it isn't Metal Gear, but it is the next best thing, and definitely worth a play through if you are an xbox owner.