The new version of Apple’s operating system (Mac OS) Mountain Lion obviously achieved a great success, positive evaluations are given from the critic to the user. In the 3767 evaluations of the App Store, 3156 are 5 stars, the average total score reaches 4.5 stars. But there are still a handful of people do not like it, 190 individuals gave a star rating.

The reason they do not like seems to focus on one thing: the AirPlay mirror, this function can project images on your computer screen to Apple TV, which can be judged as that one of the best selling point of the functions in the Mountain Lion. But this function does not support part of the early MAC (actually not that early, part of Mac before the mid-2011 can’t be supported, which also has just been one year).

A one-star reviewers wrote:
I am very disappointed to the Airplay mirror which can only work on the latest iMac and MacBook Pro, I spend money for this function, but result in no use, this is the first time I was very disappointed to Apple.

Apple officially listed machine that supports the Airplay mirror: iMac (in mid and late 2011), Mac mini (in mid and late 2011), MacBook Air (in mid or late 2011), and the MacBook Pro (the first half of 2011 and later). If you have an Apple before 2011, then it may not support the Airplay mirror.

There is argument that Apple did not do it in order to force the user to purchase a new Apple computer, just because the early Apple computers video card can not support Airplay mirror function. Many people are expecting to this function, the results in no useage, which makes them very depressed.