There is nothing wrong with integrated graphics...for the average user who does nothing but check emails and browse websites. For anyone else, it is absolutely painful. Take me, for example. I am a PC gamer and I tend to change out my video card almost every year or so to get the maximum performance, and I'd do the same once I get a Mac Pro. For professionals doing lots of video editing, 3D animators, etc, it is equally important for maximum performance.
Unfortunately, the only Macs that have the ability to upgrade video cards are the Power Macs and Mac Pros. I can hardly even run a Mac version of one of my games on my Mini just because the 2yr old integrated Intel GMA 950 is slower than my 1992 electronic organizer 🙄.
I'd say for 80-90% of the computer users out there, integrated graphics is just fine and dandy. 🙂