Finale has a very, very steep learning curve; it has irritating bugs that have been there for a long time and are not yet fixed; it relies too much on the user's own inventiveness in creating workarounds; some of its modules are clumsy; its help section is immense in its size - and very confusing. It is all true.
But what is also true is this. I have been using it heavily since 1994 to create a variety of scores - including graphics driven experimental ones - and during that time it crashed twice (yes, twice). Not bad, right? It makes it one crash per seven and a half years. I would like to see another Mac programme which is so sturdy. Finale offers unmatched flexibility in terms of advanced notations, MIDI manipulation and the like. It is very highly customisable - you can focus on some modules only, those which you know you will use. The other modules are always out of your way unless you need them. Once you've mastered it, Finale is a delight, many of its plug-ins saving the conscious user dozens of hours of potentially crippling, time-consuming work.
Finale is not perfect and never will be, but it is nonetheless way ahead of its competitors in terms of the sheer number of options it gives the user.