Just some very vocal individuals on a niche website, and some trolls.

My own experience of Yosemite has been the polar opposite of many here; better stability, faster, longer battery life etc. All on a 2011 MacBook Air. I never had any kind of issue with iOS 7 either. The odd reset over the last year on my iPhone 5, but the significant majority of the time (99% at least) it worked and it worked well. Sorry to rock your world view, but have you at least posited that these people vociferously complaining are not representative of the whole? Ditto iOS? I know you will chalk me up as another "fanboy"...