Lack of long term support.
The current poor state of their software.
iOSifying OS X and the dumbing down of their professional products.
General lack of openness in their ecosystem.
Underpowered hardware in their desktop systems.
Lack of serious attitude towards gaming (ie. Lack of up to date opengl drivers and other 'features' or things overlooked that make gaming inconvenient.)
It is these things that make Apple's products no longer worth their premium price. Long gone are the days of their sexy, powerful computers with a solid but also open ecosystem.
Hopefully, they will fix all my bugbears in their products and i can return to loving Apple again. I doubt it'll happen though.