I picked this up in order to find some great uses of language, but read it through for the historical interest.
It is presented as a chronicle of oratorical skill. This partly explains the Western bias in the selection - the editor's excuse being that linguistic flair is not best served in translation. However, as another reviewer pointed out, the entries are heavily abridged, so there is rarely any sense of a speech's structure. As such, if you want to know how the greats worked their audiences, you will often be disappointed.
However, as a young man not especially well informed about 20th century history, this was a great way to tie together different events, and to see the contemporary spin that was applied to major issues. The editor's brief introductions and codas set the contexts well and help link pieces up, making a highly readable collection of historical snippets that is satisfying to follow from cover to cover.
As a reference book on oratorical moments - how it seems to sell itself - it is limited. As a rush through history, it's easy education: in the moment, hindsight absent, events worn out at school get a great narrative drive.