It's only useful as a privacy layer for payments.

Monero's exact use case is private digital cash. Send, receive, earn and spend money worldwide and without restrictions. No bank account, government ID or permission required. As private as a physical cash transaction.

Monero's inflation rate is currently 0.87% (currently less than Bitcoin and gold, and much lower than fiat) and will trend toward 0% over time (disinflationary). More info here:

In addition, some Layer 2 implementations for Monero are being discussed, but right now, it isn't necessary because TX fees are less than 1 cent, blocktimes are 2 minutes and 0-conf TXs are relatively safe (there is no replace-by-fee in Monero).