One of my frustrations with Intel is the over-reliance on "halo marketing." Intel might make some great chips, but they're often either completely unavailable, or they bare no resemblance to the much crappier solutions that OEMs are putting in their notebooks and desktops (like dual core i5 and i7 CPUs, e.g.).
One of my buddies at work was all excited about the new Iris graphics APUs that Intel is finally shipping. Then he got a couple of systems set up at home and found out the state of Intel's graphic drivers. It's like Intel engineers their graphic cores to run benchmark programs and almost nothing else. Hopefully there are plenty of Intel users who've had a better experience; my buddy from work now has a new appreciation for AMD APUs since trying to get his Intel Iris CPUs running.
It's funny to remember when AMD actually held a power efficiency advantage over Intel years ago, but back then nobody cared. Now it's a portable world. We all want to play Far Cry 4 at 4k on our smart phones at 75 fps.
AMD may not make the most exciting products, or spend a lot of money marketing them. Their stuff works well, however, and they do a good job of supporting their products with updates and good working drivers.
Even if Zen is everything AMD hopes it will be, I am skeptical that it will do much to disrupt the marketplace. Intel is a marketing juggernaut who has no problem flexing its muscle with OEM partners to make sure there is little room for AMD at the table. AMD would have to somehow magically create a CPU capable of doubling the performance of Intel's best, then sell it for half the price, in order to make any significant inroads in terms of market share.
Still, I look forward to seeing what these new CPUs, GPUs, and APUs can do.