Well, he was undergoing huge future shock. If we'd seen him again likely he'd be better adjusted. If he was adjusted already he couldn't be as well contrasted with the other two 20th Century folks.
As for how the TNG crew reacted to them...they acted pretty much the same way normal 20th century people would react to finding time-lost survivors of the 15th Century. We're always going to think we're doing things better than our ancestors did, that's just our nature.