The is a wide selection of bundles available at once, making for a good selection of genres or themes for each bundle. This way you are not limited to one selection of games that might not appeal.
Unlike a lot of other similar sites, Fanaticals store lists games with quite good discounts. Meanwhile some other bundle sites commonly don't discount more than 5% below Steam prices.
Like other bundle sites, Fanatical often offers a large variety of bundles for not only games but also popular software and educational media at very low prices.