Tight integration of what hardware? There are, like, 5 different hardware options for Macs. And some of them are prone to a lot of problems, like ATI 4850 in some last gen iMacs, or superdrives in Macbooks.
Who cares about boot time? My computer runs 24/7, more or less. With 8GB of RAM, most of my common applications are cached and will start in few seconds. And with Quad Core CPU, batch editing holiday photos in Lightroom is real fun.
But if your fun is rebooting computer and opening/closing apps, then, well...
Funny you should say that because Windows users are commonly referred to as "reboot monkeys". I don't know how much you know about OSes, software and development, but I think even you might have noticed that PC of yours getting slower within 6 months of regular use, because of registry pollution, applications (even after uninstall leaving stuff around), disk fragmentation, rogue applications (even from Microsoft themselves) messing with your system and behaving like they own your computer rather than you etc.
This is all part of user experience, not just OS installation and initial benchmark. Any UNIX based OS is much much more resilient to user actually using it, and none of them is more polished than OS X.