Remember that framerates below 60 the game does not smooth.
Above 60FPS may you have problems also because of the frequency of your monitor. This happens because some operating systems (windows 7, for example) work at 59Hz instead of 60Hz.
Another problem can be corrected in the control panel of your video card by changing the "pre-renderized frames" to 6, 7 or 8. Try there.
Here, at 120Hz, the game is absolutely smooth. And it works 100% with the nVidia 3D Vision. It is just amazing!
Speaking about the game, well... i have to say... is simply amazing the level that reached the FIFA series. Basically the game looks totally real, a real simulation.
The animations are 100% synchronized, the AI is fantastic and play FIFA with everything in manual or semi-assisted is a unique experience I ever had in any other football game.
FIFA 11 is the best football game in the history of our humanity. Much better than any other.
But its Fifa 10 with a Fifa 11 logo slapped onto it. What does that make 360/PS3 Fifa 11, "the best football game in the history of our humanity and other species.