2 steps forward, 1 step back. There are aspects of older versions of Windows Phone that many Windows Phone users loved, and now miss, with the updates.
*With Cortana, came the loss of 1 tap access to the Bing Vision. Its still there, just harder to get to scanning QR codes and the like... Which makes it that much less intuitive and helpful when you are trying to do quick QR code scans...
*With 8.1 DP we got additional tiles columns, image backgrounds, and the access center. But we lost facebook integration, which was a wonderful stripped-down view of facebook, that actually made me want to use facebook to keep in touch with my contacts. No longer.
*Quiet time, a concept that had to reside as an app on my blackberry and android phones, are now built in, but only if Cortana is enabled (which is just too slow on my low end Lumia 521.
*Apps can now be moved to SD card, but, the limited map-moving to SD now works worse (I have to keep maps on my main phone memory, otherwise they won't load, where as before, the maps were on the SD card and worked fine in 8.0).
In generally, I am quite happy. My wife generally has no problems with the phone (she was the one who picked it out). I am actually going to try a Lumia 928, which is a more adequately powered phone, to see if some of the quirks are less. We shall see.