IMO it would be better if the front-page showed less themes.
There is a lot of themes there are just a small variation and/or branding of another theme.

What about front-page show only the main theme and its variations being displayed on another page?
This way it would make it easier to explore available theme families,
and after selecting a base theme a user could see its variations.

ps. You know i am an author of a theme, so I am biased here...