Here are my points:
By default it should list about 15 to 20 of the most recently updated packages. That way even new packages get promoted and it doesn't feel "static".
I want to select between a few high level categories (i.e. Frameworks, Utilities, Drivers).
I want to specify the version of LV that the package should support (it should take older package versions into account).
Each package should provide some key facts: Name, version, author, summary, picture, rating, price, download count, download button.
I want to open the details page if I find a package that I might like.
I want to scroll the page, not a frame inside the page.
In my opinion there is no "right" way to browse for packages, so it should rather provide options that users are willing to use and should make some educated guesses on what default settings and key facts are important (maybe do UATs?).
Since there are already a few links to our favorite pages, here is one of mine. It is for a game, but I think the "card" design could work for GCentral as well: https://mods.factorio.com/