Petra is a Finnish girl who, in the storybooks, is able to fly around the world and see many different cultures. On the Petra's PLanet MMO, the player does what Petra does: Go to different countries. There's nothing special or amazing about this, and that's what's special and amazing. In a decade, we've gone from 4 MMOGs and perhaps 6 immersive world-type games, to the point where a small country's story for children spawns its own immersive virtual environment.
Remember in 1995 when the headlines screamed "Soon there will be computers in cars and refrigerators!" Well, today there are indeed computers in cars and refrigerators, but there's big headline. It happens without noticing.
Therefore, take a moment to notice Petra's Planet.
Substantively, is this a good thing? You've walked through Epcot and enjoyed the sensations induced by faux-France and faux-Norway. You tink, hey I learned something about France and Norway today. But did you? Maybe you actually lost knowledge about them.