I'd like to say no, but then I'd be a HUGE hypocrite, because just this past Thursday, my brand new, 21.5" 2.9, SSD, 16GB Mac arrived and I'm loving it. When iMacs (or any Mac) are working right, there is nothing better.
But, with that being said, the following is my disappointing history with iMacs, which probably speaks more to the myth (at least in my experiences) that Apple computers have the highest quality workmanship and quality control. Meanwhile, my work Dell laptop and ancient office Dell desktop are workhorses and keep on ticking without any hardware (or software) problems.
Before I start, you should be aware of Apple's shoddy history with respect to graphic cards since 2006, a quality problem that they forever denied. As I'm typing this on my gorgeous new iMac, I'd be lying if I said I wasn't skeptical, sometimes thinking that I made a mistake and that there will be some hardware failure, whether it's a graphics card or logic board.
Okay, now my iMac history-
1998 - Purchased the original, blueberry iMac. It was very unique at the time and I loved it, other than that hideous hockey puck mouse design. It worked okay, but the HD had such a high pitch sound that it would pain me to sit at the computer for any longer than 15 minutes. I'd get ear and headaches. This was a common complaint on the Apple Support Forum, other than the usual, obnoxious Apple fanboys who trashed those who had the nerve to complain.
As usual, Apple denied any problem. Had one replaced and received another with the same issue, so I had to live with it.
2002 - Apple G4. It might have looked like a desk lamp with a floating screen, but this was the least problematic iMac I've owned. No more high pitch whine, which was a relief.
But, typical of Apple "quality" it had a short shelf life. It crapped out after 2 years. This lead me to by a PC and i DESPISE Windows, so in
2006: I purchased the late 2006 iMac. Loved it till I started experiencing some weird monitor behavior in 2009 that kept getting worse and worse till I had to delete graphics-related files just to get the machine started. This was the start of Apple's faulty graphics cards, which of course they denied existed until five years later and despite thousands of similar complaints.
As an aside, I purchased a 13" MacBook at the same time. Three years later it wouldn't charge or start. Apple, in their usual fashion, denied a battery issue, even though there are tons of similar complaints about this issue, even with the replacement batteries. I had to purchase a battery and a year later donated it to charity.
2010 - Purchased the mid 2010 iMac for my wife. After 8 months it died. Seemingly, the logic board went kaput out of nowhere. Of course, Apple had to replace it. Today, the replacement is still running fine.
2013 - Like I said I just purchased the late 2013 iMac. I'm loving it, but I wouldn't be surprised if something went wrong in a year or two or three. That's Apple quality/denial for you. I know I must sound liek a masochist considering my bad Apple experiences, but I'm keeping my fingers crossed. When they operate, no PC can match it.