We all know about cryptocurrencies and how they work.
I doubt that. Based on what I've seen in my years in this community I can say that majority of people have no idea how cryptocurrencies work. It is not even possible since there are dozens of protocols (thousands of altcoins where they copy a small number of protocols).
What you think about other cryptocurrencies?
In one word: disappointing.
As I always say altcoins lack innovation which is the main reason for their lack of popularity and adoption.