I loved the size, weight, and screen of the MacBook instantly, but put off getting one after reading all the flak about it not being usable for "real work". Heck, I've even heard sales people at the Apple Store say it. But eventually, my love of ultra-portability and retina-displays won, and I got one anyway (to replace my rooted, Arch-running, ex-Chromebook.) And I love it. Sure, I don't expect as much out of it as my 13" Pro (work machine), and I spend most of my time in the shell and vim rather than post-processing video or 3D rendering, but this thing is a joy to use.

It's not for everyone (or every computing task), but if you have a preference for the smaller screens and portability, and are aware that you're willing to trade raw machine grunt for this portability, then I wouldn't write off the MacBook just because "someone on the internet" said it wasn't usable.