I'm currently with Linux Mint Debian Edition on my desktop (I migrated from Ubuntu as Unity and Gnome 3 were somewhat new at the time!). If only rolling upgrades were approximately every three months, I'd be happier. Unfortunately, they're not. (UP4 was on 2012.04.05, UP5 was on 2012.09.17, UP6 was on 2012.12.19, UP7 was on 2013.09.23, and UP8 was on 2014.02.04. Only one of these was a three-monther). When I installed LMDE it was a "rolling" release. Now it's described as "semi-rolling".
To be honest, I think the issue is lack of resources within Mint. When I installed LMDE, there was an XFCE edition (which I installed). This has been dropped. Fair enough, if the 'market wasn't there, no point in using resources unnecessarily.
Which leads us back to Ubuntu. This has been successful because Mark Shuttleworth has been using his personal fortune to keep things going. I sense a need for Canonical to get (at least) to a break-even point so it can continue even after Shuttleworth's fortune is no longer available (I doubt his pocket is bottomless!).
That either means relying on donations (like Mint) or getting some commercial success. Canonical have decided on the latter, and are have adopted their behaviour accordingly. I do not begrudge them this, and wish them well.
I will try the Unity (and Gnome) editions in VirtualBox (XFCE 12.04 LTE is on the laptop). I will then make an independent judgement as to what I think of them. For my next desktop build, I might revert to one of the Ubuntus (or if I'm feeling masochistic, I might even try Arch!)
And to compare - I recently bought a retail version of Windows 8.1 and installed it in VirtualBox. To be honest I don't think it's as bad an Operating System as has been made out - but the privacy issues are horrendous (I paraphrase, but one default install option seems to be to "send all browsing history to Microsoft to help Microsoft 'improve' the user experience etc."), and the default location for documents is Sky Drive. Microsoft also dream of "monetization and profits"! Now Ubuntu might be as bad (although I doubt it), but at least I don't have to pay to install it!
Canonical is an Organisation. It needs to keep going and thrive, and I (for one) hope they do. There is worse out there!