Do you think this "MetaWindow" is much more attractive? Here's a similar looking transparent sound barrier in a new building area that is already starting to be covered in graffiti: https://youtu.be/e7-Fd1HOw_g?si=OTNn_NyV_W7iJStz&t=265

At least some light will still get through in the gaps between graffiti, but I don't think they will end up looking much different than non-transparent barriers.

It makes it more depressing to see them though. Who likes to be reminded that people will just deface public property for fun?

No, it doesn't. Before it was a plain metal wall, now it's ugly metal wall with idiotic tags on it.