Four-color Superheroes; capes, masks, codenames, kid sidekicks, hidden lairs, the government falling all over itself to thank you for rescuing them from the Insect Overlords of Antares rather than having a file on how to kill all of you should you become a problem, etc. If there is something I like better than fantasy, that would be it. If fact, give me that and I might not ever play a fantasy genre game save as a diversion.
After that, Victorian Horror, Modern Horror, and post-apocalyptic Horror.
After that, hard-SF space exploration with a few touches of space opera.