Some gaming can leave blurring in fast motion, and if that's the case, it's likely considered normal operation. The picture might be fixed by leaving "GAME Mode", however, you'll probably get a longer lag as a result.
One thing you could try is adjusting the resolution in the game console's output menu to see if that helps.
I recently purchased a 46" Samsung c6300 and was very impressed by the brightness and colours. When trying to play my xbox 360 in "GAME" mode, however, I noticed that I get a slight 'motion blur' effect... something most obvious with contrasting colours it seems. Specifically when playing NHL11, the players jerseys show a slight colour 'trail' on the ice as they turn.
Has anyone else experienced this? Is this normal, or would it be fixed if I replace with another c6300?
Thanks in advance...