Here at the Nintendo Wiki we have a policy called page classification. It is a simple system that gives each page a grade based on how well they are written.
It originally was going to be an adaption of the poll system that wikipedia uses, however it evolved into its own system.
To give a page a class you need to put the corresponding letter in the class section of the head template of the page. (excluding Class U)
Class A pages are pages that are 100% up to code. They have complete sections for all things that they should and can be featured articles.
Class B pages are pages that are almost up to code. They have most sections that they need completed, however are lacking in content in a few sections.
Class C pages are pages that are okay. They are average articles that can use improvement, but are good enough to use.
Class D pages are pages that are not up to code. They are generally short and only have a few sections, or do not follow the wiki's policies.
Class E pages are pages that are not very good. They are very short ranging from 1-7 sentences, and/or don't follow the wiki's policies.
Class X pages are pages that are short, but have all of the content that they need. Good examples are pages for enemies that only appear in one game.
Class U are pages about an unreleased or upcoming games. Good examples are pages for upcoming consoles or video games.
To add Class U to a page you must put anything in the variable "unreleased" in the Head Template.
Class ? are pages that have not been classed yet. Good examples are pages that are small or needs several content.