It's an excellent parody, Sunset Boulevard is narrated throughout in the 50's "Hardboiled detective" style, and without being able to hear that, both the original (An icon of film noir, not merely a classic) and the parody would unfortunately have little if any meaning for you. But yes, it is quite good...the drastic overacting of the girl in the parody is not out of place at all given the "Aged ham" nature of the character in the original.