Three of the things you can say about Spalding Gray are: he certainly marched to the beat of his own "drummer;" he was never at a loss for words; and he obviously felt that those watching and listening to him would be interested in every aspect of his life, experiences and thoughts - no matter how trivial at times.
Most of us are not quite as far "off the wall" as he was. Most of us aren't as interested in sharing the most minute parts of ourselves with others - even one-on-one or in small groups, let alone on stage.
But that doesn't make it any less-interesting to watch and listen to this erudite, unusual man. And after seeing one of his performances, on reflection, we can find many of his articulate musings were perhaps more relevant to our own lives and thoughts than we may have first thought.
Granted, he was a "New York/avant-garde" type of personality, and undeniably a bit "strange." (There are those who would maintain describing someone as "New York" and strange" was being unnecessarily redundant.)
I give him a "10" for the talent he presents in this genre which is his specialty.