Moria calls it "a genuine classic". 1000 Misspent Hours says it's "an enormously influential film" and closes by saying, "If any first-generation horror talkie demands to be seen uncut, it’s this one." Variety doesn't like it. The New York Times says it "makes a highly satisfactory melodrama," and adds
It has the much-desired virtue of originality, which, in no small measure, compensates for some of its gruesome ideas and its weird plot.
10/6/2009: Classic-Horror.com has a review.