The assertion that something has reached 11 out of 10 on the Nigel Tufnel decibel scale reflects a lack of understanding of the original joke. All the way up is all the way up*. All Mr. Tufnel did was to redefine all the way up as 11 rather than 10. A better metaphor would have been to relate it to an 11 out of 10 on the George Webber Beauty scale except that would lose the reference to noise.

*There's good technical reasons for this that some of you may already understand but which I could go into in boring detail for anyone who would care to ask by PM.