Enter the Dragon is his crowning achievement. A briskly paced, fantastically entertaining blend of spy caper and martial arts revenge film, it pits Bruce against an evil martial arts master named Han (Shih Kien)who holds a deadly tournament on his private island. Bruce must go there, not only to extract a British undercover agent but also to get revenge as one of his henchmen (Bob Wall) is responsible for the death of his sister. Needless to say, our hero has all the motivation he needs to tear every bad guy on that island a new orifice before the film is even twenty minutes old.
While the cast is good, everybody watching this film is here for the action. This is one of those rare occasions where every single bit of action from, the demonstration fights to the huge epics (as in Bruce going through guards like they're made of paper) is top notch.
While the fight with the guards is a marvel of cinematic violence (one of the unfortunate baddies is a young Jackie Chan) to such a degree that even the bad guy comments on how awesome it is, I think my favorite bit of business is the absolute trashing Lee gives Bob Wall. Wall's character is, as noted above, responsible the the death of Lee's sister and I think he gets in maybe half a hit while being completely stomped (literally at the end) by our hero. The difference between this and the typical Steven Seagal fight scene is that you actually like Lee which helps a lot when he only gets a few scratches on him during the final fight with Han.
That end fight is pretty cool too with a mirror maze sequence and some nice direction from Robert Clouse who does a fine job with the rest of the film. Enter the Dragon is a seminal achievement in action cinema. It's fast, funny and has some of the best action scenes caught on film. You gotta love it.