Epic doesn't see gamers as their customer - they see developers as their customer and shape the customer experience around that. For example, Epic said that if/when they add reviews, developers could choose to opt their games out of reviews. That's very pro-developer, but very anti-consumer, whatever you might think of the value of reviews. Informed customers can rattle off a long list of reasons they don't like Epic and why they're bad, but they are a small minority of PC gamers. The "silent majority" doesn't keep up with this kind of stuff or really care about it, so they are literally judging stores on their merits and Epic is a bare bones platform that doesn't offer customers a good reason to spend money in their store because they don't think they need to.
There are a lot of great suggestions here already, so I will just share Mini Review with you as a discovery tool. I like to use them because they have a lot of filters to help you find a mobile game. For example, here's their list for free, single-player, offline games with no ads or in app purchases, sorted by highest user score. They also have an app for both Android and iOS with the same info and filtering as the site.