It's mostly crap. What you get with universe and multiverse packages is essentially a snapshot of Debian development at the time U+1 was forked from Debian testing or unstable. There are packages which are also in the stable branch of Debian or may later become packages in that branch, but often more changes are made before it goes into the next Debian stable release.
Secondly, a package in Debian stable mustn't have any applicable release critical bugs at the time the release is made. If after release a package (in Debian, Ubuntu or any other derivative) is discovered to allow for remote code execution in its default configuration for instance, there's no hiding behind what it says on the tin. The bug doesn't care how it's labeled and you should act on it.
Thirdly, packages in universe and multiverse only get community support, as opposed to support from Canonical for the duration of the support cycle. The entire point of having a repository system (like apt or yum) is that you can mix and match them to your liking and choose which packages may come from which source. So if you can get better support elsewhere, there should be no stopping you from subscribing to that support channel.
Personal package archives I'd generally not recommend because they may not be vetted as well as the more official repositories and the support commitment (when it exists) might not be at the same level. Could be better or worse, but you'll have to evaluate that on a case-by-case basis.
Secondly, a package in Debian stable mustn't have any applicable release critical bugs at the time the release is made. If after release a package (in Debian, Ubuntu or any other derivative) is discovered to allow for remote code execution in its default configuration for instance, there's no hiding behind what it says on the tin. The bug doesn't care how it's labeled and you should act on it.
Thirdly, packages in universe and multiverse only get community support, as opposed to support from Canonical for the duration of the support cycle. The entire point of having a repository system (like apt or yum) is that you can mix and match them to your liking and choose which packages may come from which source. So if you can get better support elsewhere, there should be no stopping you from subscribing to that support channel.
Personal package archives I'd generally not recommend because they may not be vetted as well as the more official repositories and the support commitment (when it exists) might not be at the same level. Could be better or worse, but you'll have to evaluate that on a case-by-case basis.