I deeply enjoy Allen Tate's poetry. I've read very little of his criticism, but was just recently drawn to this essay he wrote in 1928. He places her both inside and outside historical context, specifically somewhere between Emerson and Hawthorne. But like Harold Bloom, he likens her mind to Shakespeare's. Anyway, it is a marvelous essay as much for the writing as the ideas and the insights on Dickinson. Remember, in 1928 he wouldn't have known about many of Dickinson's best poems!
Read and enjoy!