I like Bruce Lee and am a fan of his shit, but there are/were far better Martial Arts movie stars out there imo. Bruce Lee in Martial Arts movies is a little bit like Pac in rap music. They were good and people liked them, but their death put them on a whole other level.
Hung Ching Pao (Sammo Hung). He got all the fighting styles down. Check Spooky Encounters where he's possessed by black magic and switches up different styles. I also really enjoyed his last Mob Movies - check the avatar. He a Boss)
Li Lian Jie (Jet Li). He was Chinese Champion and World Champion in Wushu several times. He a real one.
Long Cheng (Jacky Chan) - He was held down like the others by movie companies and directors who just wanted to copy Bruce Lee. I'm not much of a fan of his newer movies, but there is no question bout his talent.
Yen Chi Tan (Donnie Yen) - His performance in Ip Man as Bruce Lee's teacher was nice. Reminded me of Jet Li in Once Upon A Time In China.
Chia Hui Liu (Gordon Liu) - 36 Chambers, Shaolin Mantis, Challenge Of The Ninja, Return to 36 Chambers, and many more.
These are just some of the martial artists who can hold their own.