this is a dumb comparison. splinter cell is a third person shooter which is a one man army type of game. mw2 is a first person shooter that you have to work as a team to win.
You don't have to work as a team to win why do you think there is so many teamkilling nine year olds? and splinter cell is much better I preffer stealth.
Because it's physically impossible to not communicate with your team in any way-shape-form-or-fashion and still win in MAG... [/sarcasm]
Back on-topic, it is a completely useless comparison, they aren't the same category of game, whatsoever. One is a Stealth-Action game and the other is an all-out FPS. While MW2 has tons of re-playability because of it's popular multiplayer, Splinter Cell is still great fun, there really isn't a much better feeling than clearing a room with 10 people in a split-second using only a giant chandelier, four bullets, and a fatal drop onto the neck of one unlucky armed guard.