Although the movie isn't as good as the cartoon (and to expect that it would be would've been outlandish), it's up there. Paramount and Disney captured the flavor of the characters. While Robin Williams doesn't look like Popeye, the way he plays the part more than makes up for it. The other characters both look and act the way they do in the cartoon. The songs and the scenery are very good too. An added plus for true Popeye fans is that we get to meet Olive's relatives, which do appear in comic strips but not in the tv or theatrical cartoons. The only major difference between the cartoon and this movie is that Popeye hated spinach until Bluto shoved it in his throat. (In the cartoons Popeye liked spinach since he was a little kid.) But at that pivotal moment at the end, he immediately learned to like spinach.
Popeye defeated the tax man, and for good reason; he taxed people for silly reasons. (He was probably greedy.) Once he'd been in Sweethaven for a couple days, he learned that his long-lost father (Pappy) is the Commodore for whom Bluto works (whom Popeye eventually finds). Popeye's arrival shows Olive how mean Bluto is. Olive then falls in love with Popeye.
At the tail end of the movie The Great Depression is mentioned. Without those lines we'd get the idea that the setting is in the 19th or early 20th century. After all, no one has a car, a telephone, radio or tv. A classic must-see.