I tracked down this book after reading Lenin, Hegel and Western Marxism. Prior to this, I had only read What Is to Be Done, Lenin's defense of vanguardism and revolutionary discipline. Stylistically, National Liberation, Socialism and Imperialism is similar. Lenin is brilliant at debating orthodoxy with various Marxist factions, attacking his opponents while staking out his own ideological position on the issues of the day. At this level, reading Lenin is a bit of a guilty pleasure, since his books, tracts, pamphlets and articles so clearly inform our perceptions of how revolutionary parties debate, whether through the political posturing of Totalitarian regimes or the comedic parodies from Monty Python's People's Front or Judea.
Still, this work is interesting and important in rethinking the popular perception of Lenin as a doctrinaire authoritarian. In National Liberation, Socialism, and Imperialism, Lenin writes forcefully and passionately for equality among nations, democratic representation, and the right of national movements to pursue liberation from imperialism. This position almost certainly informs later Soviet Union foreign policy, but it also sheds light on how and why many national liberation movements embraced communism because of Lenin's strong defense of national self-determination and equality among nations.
This is clearly a book that can be enjoyed on multiple levels as an historical document from the period just before and after the Bolshevik seizure of power, as a text that influenced national liberation movements throughout the twentieth century, and as a quintessential text of social revolutionary debate and rhetoric.