Toooooo much room for the Marx Brothers
In every Marx Brothers film I can think of they are contained in a small or relatively small space which makes the comedy bounce off the walls like a ball. However, in the vast open west the ball just kind of stops bouncing. Examples of Space include:
Coconuts-Hotel
Animal Crackers-Mansion
Horse Feathers-College
Monkey Business-Ship
Night at the Opera-Opera House
Day at the Races-Sanitarium
The Marx Brothers need this tight space so that the Victims have no choice put to put up with their craziness. In the West the Marx Brothers have nothing. A few scattered people here and there but very little to play off of or work with.