One of the most "user friendly" ways to spend tokens right now. Great for devs trying to utilize Web3 for building on Ethereum
UX is still not great (which says something about crypto UX in general that this is one of the best out there)
Metamask is one of the only ways for people to interact directly with Ethereum apps at the moment. They have an early mover headstart but will have to work on their UX if they want to stay ahead.