Context is key:
An FF with a few waffles.
Lacanian Neo-Leninist (Maoist? Stalinist?) Nutter who is seemingly unable to ever structure more than three sentences into a coherent paragraph about anything at all. In short if you like Byzantine self-contradictory political theory explained through even more Byzantine self-contradictory French Psychoanalysis, then Zizek is for you.
I really can't recommend his articles enough. Many of them are very coherent.
On the West Bank
Various
To be honest I was mostly basing my opinions on that work he did on Lenin and a book entitled something like You call that Totaltarianism, oh and some of the film commentary he did. When he's not using Lacan as a crutch for his arguments or trying to fit into the fashionable beardy-lefty cliche he can be interesting.
In a thread entitled (if you can't guess it already, you probably fail the thread) "Opinion of Slavoj Zizek".