Ask HN: If a previous startup failed with your same idea, is that a bad sign?

The app we are currently wanting to develop has competitors, but none of them have any traction on the app store. Hardly any downloads or reviews.

Is this a sign that no one wants this type of app or is this a sign that they failed due to not enough people knowing it exists (bad marketing)?

Also, what percent of a startups (let's say app company) success is reliant on marketing?