If you spend the time to research and get the parts that are supported by OS X, building a Hackintosh is breeze. I have had no problems with the one I built.
That's sort of what he's going for though- remember the old days of Linux when only certain devices were supported? When using OS X like this, you don't even have the luxury of writing in new code to support them.
It's definitely limited. But hackintoshes are a planned and strategic undertaking. You want OS X but don't want to pay the rape rates requisite of the apple brand. So you build your pc based on the hardware guide so that everything will work from the start. If you need to add more hardware, you just buy the brand that will work. There's not enough limitation to make it suck, and you're paying 700-800 bucks for a computer that the mac equivalent would run you 3 grand.
You've really got to just follow the hardware guides to the tee, and I personally recommend using their prebuilt configs. If you go on tonymac or the other hackintosh sites they will have different hardware lists that are more or less guaranteed to work, as all the components will be ones used in mac desktops and have built in support. There is definitely a huge dick around if you try and be adventurous and go off the beaten path, and you will spend hours messing with the loader configs and kexts etc.