NewsGuard does a good job of giving reasons why they rated a site a certain way. Their reasons are generally about journalistic integrity (funding sources, willingness to correct errors, making opinion/fact differences apparent) not political leanings, which is good. In general, I don't like to rely on the overall rating (green or red) that they give, but I find the breakdown of "nutrition facts" very useful. I feel like the categories they choose to rate on have given me a vocabulary of attributes to look for in all news and information outlets, even when I'm not using the extension.