This movie review is shamelessly stolen from my Martial Arts site, Fighting Is Your Friend. I promise, I am re-posting with my own permission 
Jackie Chan makes some of the best Kung Fu movies in the world. He has also made some of the worst. Thankfully, Who Am I? (made in 1998) falls into the former category. This is a great movie to introduce someone to Jackie Chan with.
Jackie Chan’s Who Am I? rates a solid 8/10. The action is absolutely first rate - Jackie is fighting at his best here. The movie is funny, too (as all his movies tend to be). The only reason it doesnt score higher is because the plot and dialog are so cheesy. This is standard fare for Jackie Chan movies, but I suspect it was made worse by the dubbing. If you love Jackie Chan movies, you’ve probably already seen this, but if you are looking for the perfect movie to get someone “new” into his Hong Kong style movies this is it.
The short version is: this is a must have for any Kung Fu or Jackie Chan fan.