Splinter Cell?

I'm too aggressive for stealth games. I got Splinter Cell: Double Agent from GameFly last week, and loaded the training missions since I've never played an intense stealth game before (I don't count Metal Gear Solid as strictly stealth since you can still shoot people if you really want to). My 'handler' told me that lethal force was not allowed, and I had to sneak past everyone and avoid any kind of detection to complete the objective. In the first mission, I disabled the security cameras, walked through the laser trip wire, triggered the alarm, and took the objective. In the second mission, I punched the cop, walked into the next segment, and on the staircase overlooking the maze with the two terrorists clearly visible, I pulled out my gun and shot them both. Then I walked through the maze and completed the objective.
When I tried the first mission, I shot the first couple of guys in the face, infiltrated the base or whatever kind of facility it was, and shot people in the back. Then I was gunned down. I did this two or three more times, and decided that enough was enough, and I sent the game back. I'm sure that Splinter Cell and the like are really awesome games, but I don't have the patience to sneak around everything. I like games that let me utilize the direct approach, like Halo, and GTA IV, and Asteroids.