I'm a European immigrant to Copenhagen, and by chance lived on Christianshavn for the first few months, so I asked many Danes what they thought of Christiania.

There was a wide range of views.

Older people (40+) tended either to moderately disapprove, or to be very tolerant. Younger people (25-35) were more extreme; they either strongly defended the place as you do, or were definitely against it. I haven't asked enough youths to be able to generalize. People from Copenhagen were often less tolerant than those from Funen or Jutland.

I think it depends when people last saw it, how often, and in what circumstances they visited.

Going on a wet November evening just to buy drugs isn't great, it feels dodgy. Warm summer evenings are nice -- just like everywhere else in Denmark. Pusher Street felt very tense a couple of years ago; I was approached by "security" for having a camera over my shoulder, but this summer it's very relaxed, since the stalls are open and no longer covered in camouflage netting.

That cannabis is legal-ish in some of the US isn't especially relevant. It makes as much sense to compare a Danish pub during American prohibition.