I like the direction Apple is headed with their software. In my opinion, it is much better than the competitors. It is a joy to use my Mac every time. I think part of what your frustration may be tied to, is that Apple gets ahead of itself sometimes, and doesn't fully execute a new feature like they would like and have represented. All of it is part of the technological / societal learning curve, in my opinion.I was just super excited with Apple talking about Metal. It really seemed as if they were trying to fix the wrongs in iOS 8 and even giving extra battery life to the 6. Time will tell and I honestly wish it is better, but my experience with updates have always been negative.
Give iOS 9 /El Capitan more time to mature. You may be pleased. At least look at things as objectively as you can. Doing that lessens the disappointment we often set ourselves up for.