The character of Popeye was entertaining enough early on in the Fleischer Studios days, when William Costello was doing vocal duties. But the real spark that made Popeye special was when Jack Mercer took over. Mercer started as part of the animation team and then became the voice of Popeye. The choice of Mercer was perfect, because Mercer basically created Popeye's personality, particularly with the mutterings and under the breath asides Popeye would make that were usually funnier than the principal dialogue.
Plumbing Is a "Pipe" is an excellent example of this aspect of the Popeye shorts voiced by Mercer. Listen for Mercer's remarks throughout the final four or five minutes of this one. That, and the fact that Wimpy is a "plumber", are hilarious and make this worth tracking down. Most recommended.