Could the UIs and third party application situation be better? Of course. But considering all the garden variety crash bugs, power management bugs, lockup bugs, video driver misbehavior, hit and miss peripheral support, and in general just analysis paralysis about what hardware I should buy, and even then there is a less-certain future with regard to regressions.
Even given Windows's monopoly power in the commodity desktop and laptop markets, its reputation for dealing with sleep and drivers is only so-so compared to Apple Hardware and Software. If Window's monopoly power -- which buys you full attention from hardware manufacturers and their driver divisions -- only gives you mediocre results, what are the odds that a bunch of kernel hackers who receive almost no continual consideration from hardware vendors have a chance? To me, it looks like absolutely not a chance of becoming stable over time. I have completely given up on Linux laptops for this reason: by using desktops with Linux only I have cut out a lot of the problems, but not all of them. It's a kind of medicore that I can bear.
I want someone to sell me Linux distribution on a laptop that simply will not break over in its kernel-oriented features in five years of upgrades. I want that distribution to stop-ship if it a new version introduces a power management bug to an old laptop, and do whatever it takes to work around some lousy hardware bug or whatever. I want them to do whatever to work with Skype (such as statically linking whatever libraries, etc) and test Google Hangouts to make sure the webcam and microphone works. And it they don't work, they absolutely cannot ship. Until that day, I use Linux -- and I do mean the kernel in most of these cases -- as my personal operating system most of the time in spite of these problems because of my professional and philosophical needs, and not out of preference in any other dimension.