Surely the difference is that War & Peace (or any other lengthy book for that matter) is reading for readings sake, whereas Brand is trying to get a point across? War & Peace is (probably, I've never read it) a fantastically interesting read, and does what it aims to do - but Brand pontificates...
I've got nothing in particular against Russell Brand, but good lord how can you say that's a good piece of writing? He takes in excess of 1,800 words when his actual message is less than 300! The below is quoted verbatim (otherwise it could be cut down to about 3 sentences).