11.10 was when I switched over to Mint and never looked back, and it seems that doing so was a wise move, given the Amazon adware/spamware/spyware that Canonical saw fit to include in more recent versions.
http://www.markshuttleworth.com/archives/1182
Even though Mint includes proprietary binaries (like Flash and Audio/Video codecs), which may or may not contain opaque questionable material, at least the third party non-open-source software is something that (arguably) improves the distribution and actually serves a purpose for me, as the end user.
Mint has changed over time too, though, and now I'm thinking about moving to a personally customized Debian image, and a hobbyist project. Hopefully it won't prove to be too demanding to pull off.