The Three Stooges were known for nothing if not wild farces and slapstick, and 'The outlaws is coming' is full of both. The physical comedy and sight gags, accompanied by choice practical effects and sound cues, are amplified to such a heightened level of absurdity that the picture is outright cartoonish at times. It's arguably a little too over the top to wholly appeal to all audiences, and in some other ways it very distinctly hasn't aged well - which is to say, chiefly, strains of racism (especially where Native Americans are concerned), and making the wanton destruction of wildlife into a passing plot point for a comedy. Still, after all, this is built from the ground up only for fun, and with further situational comedy and anachronisms to cement the humor, it's a reliable good time from start to finish.
The cast is a joy, giving wildly exaggerated performances to match the chaotic energy of their characters. Of course Moe Howard, Larry Fine, and Joe DeRita take the spotlight, but it's a pleasure to see Adam West here as well, lending his relatively straight-laced poise as a counterbalance. Reduced to only a supporting part, Nancy Kovack is similarly capable as Annie Oakley - a solid part as written that I'd rather like to have seen given greater prominence. And the large supporting cast, portraying embellished interpretations of famous figures from the Wild West, do just as much as the Three Stooges to maintain the ridiculousness throughout. Norman Maurer illustrates capable skills as director, and Aaron Nibley as film editor, and smaller details like costume design, hair and makeup, stunts, and set design and decoration are all marked with fine contributions.
Honestly, in most every regard this is rather well made. I think the sticking points rather just come down to personal preference. I think 'The outlaws is coming' is consistently amusing, but it's never robustly funny in the way one would ideally hope for in a comedy. The humor has more in common with the silliness of 'Merrie Melodies' or 'Looney Tunes' than the sharp wit of Carole Lombard or Buster Keaton - which, true, is exactly what we expect of the Stooges, but I favor a more refined flavor. And again, the blase attitude toward the near annihilation of buffalo is off-putting - and much more so the pervasive depictions of indigenous peoples, here crossing a line that just doesn't hold up to even minimal scrutiny. These are elements that I feel could have been handled much better, even in 1965, without significantly altering the story the movie is telling.
The faults need to be acknowledged; I think it's a mistake to overlook them. All the same, there's only earnest intent to entertain, and in that aim the picture succeeds. If too nonsensical for its own good, this is a feature defined with strong gags, an able cast, and sturdy technical craft and rounding details. It's not essential, and it's not going to be best suited for all viewers, but is broadly enjoyable if one has the chance to watch it. 'The outlaws is coming' is a classic sample of the jazzed-up foolishness that the Three Stooges were so well known for - and one way or another, that description pretty well speaks for itself.