In my experience Apple hardware is much better than other "assemblers". Their support is also significantly better.
I usually build my own desktops, so I can't really speak to Apple desktops, but as far as laptops go, I've yet to find any laptop brand that provides the same level of reliability, quality, and performance.
Over the past 6 years or so, I've had a number of different laptops, off the top of my head I've had IBM, Lenovo, Apple, and Dell. In all those cases, I've had 2 or more from all the manufacturers. Both of my Apple laptops did a great job playing most games, even though I had to dual boot in a lot of cases. They both lasted a LONG time compared to the others, my 6+ y/o MBP is still going strong, while a number of the other laptops I've had for shorter periods are either dead or showing signs of being EOL.
For support, my experiences with IBM and Dell are too far in the past to comment on. That said, I did just buy a Lenovo Y580 to do some work (and play a few games on) on, so I can comment on how that arrived. I do have to admit that the quality and "feel" of non-Apple laptops has improved significantly over the years, the Y580 definitely demonstrated that. I was all excited that I didn't have to pay $2500+ to get a decent laptop when the GPU started showing artifacts all over the screen. After a bit of Googling, I found that this was a problem with a handful of early devices. I called Lenovo and after a brief conversation we concluded it was a h/w issue and the GPU would need to be replaced, so they instructed me to send it back. I did so and got it back 2 weeks later. The technician had imaged the hard drive and sent it back, no repairs. After calling Lenovo 3 times in one day trying to determine if I was eligible for a replacement, I was told that I was not and would have to send it back to be repaired, AGAIN.
I've never had that problem with Apple. I've had their hardware fail. I work with computers enough to understand that happens and not get bent out of shape over it. When I had a problem, I walk into the Apple store (I hate them, but I deal with it), hand it over, it's fixed in a few minutes, then I walk out the door. I've yet to have any kind of positive experiences like that with another manufacturer.
These are my experiences, anyway. I'm hoping when the Lenovo is fixed, it'll last as long as my Apple laptops has. Aside from the h/w and support being disorganized, the build quality seems to be on par. Until then, I can't say I've had many positive experiences with non-Apple laptops, especially for gaming.