See, this was in the long-gone, pre-Scary Movie days when an actor like this cameoing in another film poking fun at himself was actually rare enough to be funny.
Not to mention there was about, what, 12-15 years between Alien and this, as opposed to the 12-15 weeks between original-to-satire nowadays.
Personally while I like this film, I feel it really hasn't held up very well in the years since its release. IMHO I think this is probably brooks last good film, that said though even before this I felt a lot of his films are hit or miss.
That and much like Monty Python I feel a lot of brooks fans, specifically the young Frankenstein and History of the World fans, really make me hate his work and make it very hard for me to enjoy his films (if their not obnoxiously blowing his film work, they unbearably quote him till i want to vomit in rage).
either way this was his last watchable film, after that he just got really sad and lost sight of what a good parody is. i mean Dracula:dead and loving it...seriously!?