Since Facebook/Meta announced its Q4 2021 earnings report today — the first quarter of the company operating under the new name Meta, with a stated direction of making the metaverse — let's take a look at its first attempt at launching a metaverse platform for a mass market.
I'm talking of course about Horizon Worlds, open to the public late last December. Here's its user ratings so far, taken directly from the Oculus app store:

3.5 stars from 541 Quest users is… not bad, I guess, not atypical for an open beta launch.
These ratings also give us some insight into how many people have installed Horizon Worlds. As a general industry rule of thumb, for every single app store user rating, assume there are 50-100 other users who did not take the time to rate the app.
On that assumption, roughly 27,050-54,100 Quest owners have installed Horizon Worlds since its closed beta launch.
Now let's compare that to two other metaverse platforms also available on the Oculus app store, with similar features and functionality. First up, VRChat on the Oculus Store:
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