I suppose the best thing that could be said about this primitive kiddy one-reeler from 1910 is that it's cute or somewhat interesting. As noted elsewhere, this adaptation is based more so on Baum and Julian Mitchell's 1902 play rather than on the original book by Baum. Everyone's familiar with the 1939 Judy Garland musical (if you're not, why are you here?), so this 1910 film can be interesting as comparison. Baum himself supervised three adaptations of his stories in 1914, beginning with "The Patchwork Girl of Oz"; all three have been available on video, as has a 1925 "The Wizard of Oz".
This 1910 Oz is very theatrical, and most of its tricks are theatrical, too: moving backdrops and strings for flying. A couple stop-substitutions are about the only thing cinematic here. A static camera, tableau style and staginess are to be expected in a film this early that was adapted from the stage. This film, however, features annoying spastic performances—even more so than in the 1914 trilogy. The filmmakers didn't have to do any cramming for a 13-minute adaptation, nor use lengthy title cards to explain the basic plot; in fact, much of the picture is spent by characters jumping around as though they're hopped up on sugar, including some dance interludes probably held over from the stage version. Furthermore, this edition was followed by two subsequent Dorothy Oz installments, which are now lost. I wouldn't recommend this kiddy flick, but, apparently, some like it.
Among the cast is a young Bebe Daniels as Dorothy. Daniels later worked in a few silent films by Cecil B. DeMille and is now mostly famous for her role in "42nd Street" (1933). Reportedly, Alvin Wycoff, who would be DeMille's longtime cinematographer during his early career, which included the innovatively photographed "The Cheat" (1915), also has an on screen role in this production somewhere.
Review by Cineanalyst from the Internet Movie Database.