Mabel Normand gives a very lively, engaging performance that makes "Mickey" an entertaining movie with several other strengths. The supporting cast all help out as well, and the story effectively moves back-and-forth between the backwoods and the big city. It combines comedy and melodrama effectively, and while it contains mostly familiar elements, it's the kind of movie that is quite enjoyable to watch.
The role of "Mickey" gives Normand some good material to work with, and as always she is sympathetic and charming. Part of the story is set in a mining settlement, where Mickey is right at home, and part of it moves into high society, where she is ill at ease. Both settings are believable and make good backdrops for comedy, and both are also used to bring things out about Mickey and the other characters.
The supporting cast, which includes Wheeler Oakman as Mickey's suitor, has its own comic moments, and Minta Durfee gives an effective performance as the snobbish society girl who is Mickey's romantic rival.
While none of the components of "Mickey" are especially imaginative or innovative, they are all of good quality. It all fits together to make an enjoyable movie.