Very good cartoons from Fleischer Studios were many, some gems even, and have always much preferred their output as far as Popeye cartoons go over that for Famous Studios, though the latter's output was far from bad at all (just not as funny or as consistent). The stories were very thin and samey, but the cartoons, and the series in general actually, were mostly very charming and funny, well animated, scored and voiced.
'Mutiny Ain't Nice' is not one of the best Popeye cartoons to me. It is regardless very enjoyable and never less than very funny, its best parts being hilarious. Speaking as someone who has always enjoyed many of the Popeye cartoons a good deal and liked Popeye very much, Fleischer's efforts were always well animated and scored with lots of entertainment value and great chemistry between the characters.
There is not an awful lot wrong, though it is formulaic and it is a cartoon that gets better when things get going. The first half was a touch bland but the second was great fun.
Did appreciate though that Olive is not underused this time and her role here was interesting and quite different for Olive. Popeye has always been the more interesting and funnier character and his comic timing and likeability has not been lost. Loved Jack Mercer's, relishing as ever the asides and Popeye's mumbling, and Mae Questel's (the only voice for Olive to do anything for me and there is a reason as to why she is the most prolific one) voice acting.
Have never had an issue with the animation in the Fleischer period (it was more variable with Famous Studios), beautifully drawn and with enough visual detail to not make it cluttered or static and lively and smooth movement. The music is also outstanding, lots of merry energy and lush orchestration, adding a lot to the action and making the impact even better without being too cartoonish. Fleischer's direction is always accomplished and his style is all over it. It's a very funny cartoon too, gags are plenty and all of them hit the mark, some of the funniest material actually comes from Olive. Some may find that the ending leaves an unpleasant aftertaste, for me it was quite interesting to see one that was different and that it happened to the person you would not expect it to happen to.
On the whole, very enjoyable. 8/10