For those interested in reading a great book exposing Deleuze and others like him, I recommend Fashionable Nonsense by Sokal & Bricmont.
And it's not like other fields don't have their own Sokal Hoax either: https://en.wikipedia.org/wiki/Bogdanov_affair
On the other hand, I think Deleuze has a deep understanding of philosophy and, to some extent, mathematics. Deleuze always tries to make a transition from traditional theories to his extreme conception of difference and repetition.
It's crazy, but it has a certain genius.