I guess there are lemons with everything. I'm sitting here still using my Q6600 workstation with no issues. I keep upgrading around it as it's still fast enough.
I am an animator so my requirements are different. A video card makes all the difference for me for viewport rendering speeds. I don't render out that much, but I did notice that my wife's iMac (which is a few years newer than my q6600) renders out at about 2x the speed.