Absolutely not!  I have a Dell Inspiron 8000 with a GeForce 2 GO and games look just as good on the LCD as they do on a monitor.  I understand what people are talking about when they say motion is bad on a LCD but it is really not that bad.  I have no complaints whatsoever. 
BTW, if you are talking about a Dual Scan LCD then YES.  I can't even stand looking at Windows with one of them.