I have a 1520. Solid phone, great camera, great hardware. Software is a letdown. I think if you are interested in WP you should already know about the sad software support. Thing is, literally every developer is like that - including Microsoft itself. OneNote, for example, got updated with long-awaited features on iOS and Android. Windows Phone? Nope.
Black just came out with the 1520 late last year and 8.1 will officially be released with new features in about a month (I have it now on my 1520 and love it).
There have been a few intermediary releases in between...so...wtf are you talking about?
Btw...no updates because none are needed to fix any bugs is a GOOD thing.