Try: https://iep.utm.edu/zizek/

He is interesting and from the little I know he says some useful things, however I suspect you really need to spend some effort to understand his philosophy before you can understand a stand-alone video of him. The “Love is Evil” video on its surface certainly seems just like nonsense to me too.

I used to watch some of Zizek's videos, though I hadn't seen the one that was linked until now. I'm no student of philosophy though, just a casual viewer so I don't think I can help much in answering your questions. I will say that he is definitely using uncommon definitions of the words "love" and "evil" as far as I can tell. As to who is this guy, I personally would recommend this video if you are trying to get a better sense of his thoughts as it is relatively clear and covers a large number of stances (the analogy at 7:15 is quite amusing): https://www.youtube.com/watch?v=_x0eyNkNpL0

On a side note, I am pleased though that you find him entertaining to watch regardless. I find it disappointing when people take speakers like Zizek too seriously; I think even if 80% of what is said is not insightful/intelligible, the occasional grain of truth can be very much worth it.