Before the Venom series and the martial art miracles of Liu Chia Liang, Shaw kung fu films were a very mixed batch of stagy melodrama and frequently flimsy martial arts. Not to take away from the many good films from that era but it's like watching pre "2001" science fiction or silent films, you have to make an adjustment in expectations and then enjoy what there is. Many of the sword films are very stagy but that's the tradition they came from. Here is a rarity, a film that mostly transcends the technical limitations of the time and is quite enjoyable today.
Since others have covered the plot quite well, I'll write about the similarities to "Crouching Tiger". The love triangle is clearly repeated in the Ang Lee film. Two super fighting women and a man who is quite frankly not their fighting equal but the object of their affection. The younger woman goes on an angry mission to defeat the number one martial artist which includes a fight in a tavern (albiet an open air one). "Crouching Tiger" is not a remake but I would wager that it was influenced by this film.
The martial arts in the film are OK until the last third when the fight scenes go into overdrive. There's a noticeable chambara influence which in this case, unlike other Shaw films, is very good. Some of the martial arts are unfortunately simulated by camera tricks but the story keeps that from being a problem. Strangely the young woman is introduced as a whip master but at some point the whip disappears and she never uses it again.
A good story driven kung fu film.