Also, accusing Deleuze of obscurantism is absolutely unfair and ignorant: Deleuze was truly one of the great teachers, those who can be pedagogical while keeping and increasing your interest in the topic, much akin to Feynman, in his works which disentangle the works of previous philosophers: Nietzsche and Philosophy (1962), Kant's Critical Philosophy (1963), Proust and Signs (1964), Bergsonism (1966), Spinoza: Practical Philosophy (1981), Foucault (1986), The Fold: Leibniz and the Baroque (1988). The aforementioned What Is Philosophy? is also extremely clearly written, and it is one of the best books ever to tackle in such a direct manner such a question.
Also, accusing Deleuze of "complicated words for trivial points" is just ridiculously funny: it's like accusing Bach of composing too much music: couldn't he just sum up all the toccatas, fugues, partitas, and so on in one single massive beat drop.