With every product or technology rises a battle some people attacks the product and others defend it, and for MOSS it is one the most debatable products due it huge success, below i gathered some posts from both sides.
With:
SharePoint is not the Holy Grail
I don't care if you don't want to develop on SharePoint, and neither does your boss
SharePoint is a good development platform for applications
Against:
Why SharePoint Portal Server is Terrible
SharePoint is not a good development platform
SO WHICH SIDE YOU ARE?!!!