I remember i've been using a number of devices that have more problem than this, but afaik i never seen people discriminate them so much compared to XZU. there's a lot of issues in previous phones model, i can name a few that i still remember:

S2- overheat, battery drain and SOD, and less pleasing performance of G-version model
Note1 and Note2: S-pen bugs in early batches, and some TW bugs
HOX: rampant yellow tint issue and short battery life
HTC One: gap, and purple tint camera
iphone: the infamous yellow tint with many people just try to live with it, and button broke, as well as the limited capabilities (such as a simple thing; initially an iphone cannot upload a picture into website)
name others, many more…...
in general, many production of phones have some radio issues such as inconsistent/weak wifi signal, Bluetooth reception problem, GPS slow lock or bugs, or some interference of phone signal.. this is the first thing that i observe/check whenever i got a new phone… this is very important, as the radio is what makes a phone a phone at the first place. none of this issue has been reported for XZU, unless isolated cases that has not been reported here.

and also note that, none of the already available phone model have stylus capability that can match S-pen on Note, but i don't know why XZU has been bashed too much about this, while on other devices people just ignore.

Sony has produced an outstanding device here, the XZU, but it amazed how it created allergy to some. While, there are many other just so-so smartphones out there… the famous BUGS meantioned did not really interfere my daily usage of XZU, but yet people exaggerated it, while for some issues if previous phones, it makes me feel like i want to throw the phone at dog already.

anyhow, i'm still loving this device. it is still an outstanding device that can stands proud in front of any other devices for the year 2013, even with the "incoming" one. lol..

cheers and have a lovely day with XZU.