Any particular reasons?
They just didn't seem to last as long, for one reason or another. They were fine when functional. We just replaced them at a much greater rate than our Macbooks. BUT this was about 2 years ago, so a lot of our macbooks were older devices without the new keyboard mechanism.
In my personal life, my 2010 pro is still going strong. My mother uses it now - no complaints. Some things have failed, the optical drive. But man is that thing a tank.
Sure on the specs/$ they were better, but overall I preferred my macbooks.