I think that statement is a little harsh. Dorico was built from the ground up, therefore it is to be expected that there would be a steep learning curve. In my own experience migrating from Finale to Dorico, after several months of use, I'm beginning to see how much more intuitive and user-friendly Dorico can be. Of course, to compare the familiarity with existing software that you may have used for a decade or more to something completely new, is about as fair as comparing a new symphony heard for the first time to Beethoven's Fifth. Give it a chance to grow on you. Expect to be frustrated as you must learn new shortcuts, commands, and myriad other things that are second nature to you in your previous software.
However, stating "Dorico is a piece of crap" is disrespectful to the countless individuals that are working daily to improve and develop this program in to something that can finally compete with the established programs that quite frankly, have often left users feeling ignored in terms of feature requests.
I'm glad that others have more patience for a new program, because it is these people that will give the Dorico team the financial resources and support to continue its development.