Normally when new versions of frameworks or software that I use come out, I like it. Except Android, because every new version of Android has lots of nice features that I won't be able to use and it is guaranteed to further fragment of the marketplace.
Android is the (old) Internet Explorer of mobile. I've never seen one application skew across versions so hard, or single-handedly fragment the space as much. (BTW kudos to MS for strongly encouraging their IE users upgrade).
What makes this perplexing is that Google has solved this problem with most of their other installed software offerings, Chrome particularly. There's basically only one version of Chrome (v 19 as I write this). Heck, even MS realized their mistake and is making efforts to roll up old IE users into the latest version. And of course Apple has done a fantastic job keeping all of it's users at the same iOS version.
I am well-aware of the OEM madness that drives Android fragmentation, and that you might think it's not "Google's fault" because of this. But I disagree. Google has vast resources and can basically do whatever it wants. If it wanted to require OEMs to build Android-upgradable phones, it could force them to do so. In fact, if they started doing this today you would hear loud cheers from around the world (and bitter complaining from the OEMs, but so what? There's a lot of money to be made and they'll get in line).