Let me also add a couple of negative experience with Apple products in the last couple of years, the most recent being just a couple months ago.
I had a new 2010 iMac27" that within the first few months started "ramping." That is, one of the fans (the HD fan) started at a normal 1100 rpm and would rapidly escalate to 5200 rpm--so loud you could hear it easily from several rooms away. Only shutting the iMac down would make it quit. Upon restart after sitting for a while, it would eventually ramp again. Overall, it took 4 trips to the Applestore, with Apple eventually replacing all fans, censors, and even the motherboard--all to no avail. And, on one of those visits, Apple cracked my computer's screen when they loaded it (in its original box and packing styrofoam no less) in my car, so I had to take it back a 5th time. I had AppleCare, and eventually someone I called my "AppleCare social worker" (a non-tech person) finally called my store's manager and told him to replace the computer. I had asked for this several times, but my request was ignored. This had gone on for over a year. The replacement iMac has not ramped, thankfully.
Recently my 20" iMac (2008) died. It was so "old" that Apple wouldn't even look at it. I found an Apple reseller who recovered the HD, which was all I wanted. In the meantime I ordered a 2011 21.5" refurbed iMac from Apple to replace the 20" iMac. It was in a totally different location than the ramping 27" had been, but--you can guess--it started to ramp by the second day I had it! I wanted a replacement, but it took escalating it up to a supervisor and a couple of hour-long phone calls just to get it replaced.
I've had several Macs over the years (I had a Powerbook 3400; I still have the 12" aluminum G4 powerbook; the sunflower iMac--all old and not currently being used--but never had a problem with them). My experiences with the defective iMacs certainly put a worm in my Apple product experience.
I think what bothered me the most was the hassle it was to lug that 27" computer back and forth to the Apple Store so many times and their discounting my request for a replacement machine, even after visit 3. Why did it take so long for Apple to replace what was obviously a very defective machine? And, why did it take so long and the necessity to get a supervisor involved for the replacement refurbed iMac--also obviously defective? It reminded, sadly, of my negative experience with all the PCs I had years ago, all of which made me swing over to Macs.
Combine this with all the difficulties I hear about with various OS and iOS and app upgrades (think about the Maps app--a real fiasco that should never have been released with all its bugs) that have made owners do all sorts of reconfiguring and jumping through all sorts of trial and error hoops (reminiscent of Windoze chronic problems), that seemed not to have been so prevalent in the past. Apple once touted their "it just works" ad campaign...don't think it would have much credibility today.