I've been using Macs since the Apple SE days. My opinion of Apple of late has been less positive. My 2012 rMBP has been the best laptop I've ever owned, yet with that said, Apple's track record with dGPUs has me worried, model years 2008, 2010, and 2011 all have issues with the dGPU.
With apple's obsession with thinner devices, they've made some questionable decisions, including the iPhone 6 (btw, I'm a happy ip6+ owner). There's really no reason to make the phone slimmer. The same goes for the iMac. Its a computer that sits on a desk, why make it razor thin.
On the software side, we have iOS 8 which by many reports and users a buggy OS. Yosemite - you either love it or hate it.
My point is not to dump on apple, I'm still an apple fan, but I think they've made a number of decisions that I think are questionable at best.
My brand loyalty is such that I choose to find the best tool for the job.