Jandek was great- there was a lot of Jazz/Skronk flavored "jamming". He did ask the audience (through a representative) that if they wanted to leave, to please do so between songs, so there was this herding phenomena when songs ended after ten or fifteen minutes.
He was everything I thought that a middle-aged outsider musician could be, and more. He sang about love, depression, and the speed at which his friend Eddie the Wino can down a bottle of Wild Irish Rose. He helped me solve a lot of problems I have when trying to sing and play guitar at the same time. His solution is: when he is singing,the guitar hangs limply around his neck. When he is done singing, he plays his guitar some more.
The Jandek-loving masses wandered out of the theatre in a daze two hours later. I really did feel hypnotized. The non-Jandek loving 10% left the theatre during the first hour, stupefying the fans. He was totally un-charismatic, but in a hilarious way. No chitchat, very little acknowledgement of the audience. At the end he got a standing O (mostly in stunned amazement) while he packed up his own guitar and got his lyrics sheet and walked out the door.

For a weirdo ex-Texan, seeing Jandek perform ever was a little like seeing the tooth fairy.