I don't think its a hard and fast league table style ranking system to be honest...
Unfortunately for many, the one constant you will find, as you quite rightly say, is the 'getting a job part'
For the rest I dare say you'll find that one man's meat is another man's poison.
You're assumed ranking looks pretty similar to my own actual ranking (not that I've spent a great deal of time thinking about it nor have I done a TR) but I would maybe suggest that PPL flight training, and PPL theoretical knowledge were harder than ATPL knowledge and the CPL training/skills test. Reason being for me, was that by the time it came to the CPL stuff, hardly anything was new, it was just more of the same and more precise, rather than a brand new discipline. In terms of the theory side, same again, if you go in depth at the core subjects studied at PPL level you will find ATPLs only slightly more advanced with the exception of G.Nav and Performance, rather than again, everything being brand new.
Just my thoughts however.