I got a S04IN and I play games smoothly at medium to low settings @ 1600x900 res. Ghosts did lag sumtymes but its playable.
If u are a serious gamer then dont go for a laptop. I have a rig for high res gaming, looking forward to 3D gaming next year when prices become affordable.
Another thing-Samsung laptops heat a little more than Asus or Dell ones so u better keep a Colling pad atleast with 4 fans
Happy gaming.