Pages is an underrated Word Processor. It has the lessons of 30 years of development and experimentation of WYSIWYG editors distilled and applied in a tight little package.
The team that created Pages, before that they were GoBe Productive for BeOS, and before that Clarris, so Pages is their 3rd or 4th redesign from scratch.
The same goes for Preview.app - it's a very underrated, super powerful app for PDF editing and lots of other stuff.