Those who don't like insult comedy will probably not enjoy this film, but that is no surprise. What else would you expect from a Rodney Dangerfield film but his rat-a-tat style of humor, with plenty of one-liners aimed at eviscerating those around him? It is probably best to compare this film with some of his other vehicles, like "Caddy Shack" and "Back to School", both of which feature Dangerfield as an irreverent rascal. Both of those films rein in the stand-up patois, keeping the humor on-target and relevant. In "Meet Wally Sparks", the discipline is lax, often inserting zingers just because, sometimes creating situations just to accommodate a punchline.
Dangerfield can portray likable, even lovable, characters. That is when his humor works the best. He is often self-deprecating. But this film makes little attempt to create a character with warmth.
A hefty number of cameos by many in the entertainment industry adds to the fun. But the obligatory mayhem/food fight scene just reminds us that this film could have been better with a script that had more focused humor.