Collection pages include useful statistics which can help users understand how popular a collection is or allow a curator to see how well recieved their content is. Users who have downloaded a collection can endorse it or leave an up or down vote on the success rating. These stats are displayed in the header section of the collection page.
A success rating is tied to a specific revision of the collection. It is intended as a measure of "does this actually work?", rather than if the user has a high opinion of the overall themes. If you couldn't get revision 1 to work and gave it a downvote, you can still upvote revision 2 independent of that. Revisions require at least 3 ratings to show a percentage. Users are encouraged to leave a rating on any collections they install to help others understand if the list creates a functional installation or not.
To ensure that the user has actually had the opportunity to play the collection, they may not leave a rating until at least 12 hours have passed since the initial download.
An endorsement is tied to the entire collection. Endorsing a collection is to show appreciation of the collection as a whole. Was it fun to play? Did it have enjoyable themes? Are you extra thankful for the efforts of the mod authors and curator who made it possible? That's an endorsement.
Endorsments can only be given 12 hours after the initial download of the collection.
Each time a user adds a collection to Vortex the download counter will be increased by 1. This does not represent successful installs as the user could have aborted the installation before it completes.