In summary, the content should be informative, user-friendly, and support the modding community. Need to ensure that the website is maintained regularly with updates and that any feedback from users is addressed.
Another point: Legal aspects. The site needs to have a privacy policy and terms of use. Also, copyright notices if they're posting modded content. They need to make it clear that All the Fallen is a mod created by fans, not affiliated with CD Projekt Red. allthefallen.moe
In the download section, including checksum verification would be good for trust. Providing mirrors if the main file is large. Also, maybe torrent options if that's the standard for the modding community. Including a changelog with each release to show what's new or fixed. The site needs to have a privacy policy and terms of use