The first 10 that came to my mind. I hated SF when it first came out, and now I play it all the time. I can't rememember the last time I played vanilla. Feel free to add some other reasons. Try and attempt some humor.
10)You can sit back and relax inside the APC transport vehicles with some friends. The seats are comfy.
9) The night vision goggles make you feel like a lean, green, fighting machine.
8) You can shoot the zip line into fallen soldiers and pretend you just crossbolted them into the ground.
7) In the palace with gas nades, claymores, nades, arty, and an APC firing into windows, your graphics card will get a good workout.
6) You can grapple up a building and then just when your teammates are near the top you can yank it away and watch them fall to the ground cursing you.
5) You can run circles around tanks on the 4-wheelers for fun and they can't hit you.
4) The gas makes you feel like you are on drugs without actually killing your brain cells.
3) The insurgents look so fashionable with the pink towels on their heads.
2) You feel well hung when hoisting the insurgent anti-tank rocket to your shoulder.
1) You can imagine you are butt naked and flashing everyone when you hoist your legs and go down the zip line.
10)You can sit back and relax inside the APC transport vehicles with some friends. The seats are comfy.
9) The night vision goggles make you feel like a lean, green, fighting machine.
8) You can shoot the zip line into fallen soldiers and pretend you just crossbolted them into the ground.
7) In the palace with gas nades, claymores, nades, arty, and an APC firing into windows, your graphics card will get a good workout.
6) You can grapple up a building and then just when your teammates are near the top you can yank it away and watch them fall to the ground cursing you.
5) You can run circles around tanks on the 4-wheelers for fun and they can't hit you.
4) The gas makes you feel like you are on drugs without actually killing your brain cells.
3) The insurgents look so fashionable with the pink towels on their heads.
2) You feel well hung when hoisting the insurgent anti-tank rocket to your shoulder.
1) You can imagine you are butt naked and flashing everyone when you hoist your legs and go down the zip line.