Enter the Dragon comes immediately to mind. I’m having a hard time thinking of a better one, for my own tastes anyway.
There are many different styles of martial arts film.
If samurai films count, try Yojimbo, Sanjuro, Seven Samurai, and 13 Assassins.
Jackie Chan and Jet Li can both be very entertaining, though their films vary a lot in style. Some Jackie Chan I think is great, especially the imaginative comedic action, and some I find really disappointing. Supercop is pretty spectacular and funny IIRC.
If you liked Crouching Tiger, Hidden Dragon, you might also like Hero and House of Flying Daggers.