Arendt's work on violence is a wonderful contribution to the philosophical consideration of the issue. The distinction she draws between violence, power, authority, and force is by far the most valuable part of the essay, allowing for the proper political and linguistic application of these concepts.
However, her interpretations of Sartre and Fanon range from plausible to completely absurd. I often found myself scrambling through "The Wretched of the Earth" (following Arendt's citations) in a attempt to elaborate on her incomplete quotations and scathing conclusions, only to be left asking myself how she possibly could read the thinkers in such a manner.
Sadly, her essay is also riddled with anti-Black racism, as many scholars have noted (See Kathryn Gines "Arendt and the Negro Question" for a full treatment of this theme in her work). She consistently reduces Black student radicalism to the desire of eliminating academic standards of admission and introducing "ridiculous reforms" into academia; I suppose police brutality, deplorable economic prospects, and continued discrimination were all off her radar. At times her bigotry is so extreme that it dives into conspiracy theory. She entertains the idea that Black Power movement seeks to create a world "in which the Negro would constitute an overwhelming majority of the world's population" (footnote 38)
This is a wonderful essay and I recommend it to anyone interested in the connection between philosophy and violence, but Arendt's elusive political commitment often shows itself as a confused normative position; you're never quite sure where her moral compass is pointing, which is obviously problematic when the issues of race, violence, and politics are the discussion at hand.