The Joseph pick, even at the time, was the most puzzling Spurs pick in the past 10 years. Even though Anderson didn't work out, that was as much due to the injury as anything else, and it's easy to go back and understand why they did it.
With Joseph, nobody really seems to have any idea what they were thinking or why they did it. The Spurs have long had godfather status with their draft picks, meaning, it seems like any pick they make must be right, even if nobody else knows or understands why. But Joseph was the first head-scratcher.
Obviously we all hope we're proven wrong, as has happened many times before.