For all its silliness, "Mighty Like A Moose" is a very enjoyable feature, and has almost everything you could ask for in a short silent comedy. The premise, beginning with a mix-up between a married couple played by Charley Chase and Vivien Oakland, is goofy, but it's amusing and has potential. From there, the script makes good use of the possibilities, the two stars bring it off well, and Gale Henry also helps out in one funny scene. There's lots of activity, very little of it plausible, but all of it paced nicely, with a number of entertaining details.
The climactic sequence is very good. There are other movies from the era that tried something similar, but this one is especially well-crafted and humorous. It all fits together well, and is well worth watching if you enjoy silent comedies.