I'm one user who has actually found DiscLabel to be a pretty usable piece of software.
Although it has shortcomings and limitations, those are more than made up by the accuracy of the built-in templates.
I have used a few other CD/DVD labelling applications, and they all required me to endlessly tweak and adjust the settings when using the standard templates that were supposed to match various label templates, and even when printing directly onto discs.
DiscLabel just worked for me.
It could be that I was just lucky. Without any detailed information about why the other reviewers find this software doesn't meet their expectations, I can't comment on their reviews in any meaningful way.
As I mentioned earlier, DiscLabel isn't perfect.
One strange bit of behaviour I experienced with it, was when upgrading to a newer version, the colours of previously saved designs were inverted/corrupted.
Fortunately I didn't need those designs any more. If I had needed them, it would have been a huge inconvenience to repeat the work.
One item I would wish for, is the ability to save or export designs for archiving and exchange with others. (Exporting editable designs into a common interchange format would be ideal.)
Even with the shortcomings, I find myself returning to DiscLabel whenever I need to print labels onto optical media.