At least from a blockchain perspective...

Take a look at some of the features others have noted:

(Source: https://www.ccn.com/crypto/expensive-failure-blockchain-experts-facebook-libra-cryptocurrency/2019/06/19/)

Some are even going as far to say that it is going to face the same issues ethereum does.

Though I think I remember reading that Facebook plans to transition it to POS once the time is right.

Which Ether is also planning on doing, eventually.