[bbrian]

Yeah, that seems a bit uninformed, though lots of people I know who like other drugs don't like ketamine. Cocaine, ecstasy and cannabis, when you're used to it, modify rather than replace what you're feeling. Ketamine can put you on the floor quite easily, with no/a crazy understanding of the world followed by twenty minutes of learning to understand it again. A lot of people don't like that. It can be taken in more moderate doses too, but it's hard to judge how much to take (how long is a line -- the same as a piece of string; tolerance develops quickly) and one can inadvertently take too much.

I think it's under-appreciated and find the experience exhilarating.