How do I know if my systems any good?

I'm not able to leave my house due to a long-standing injury, so I'm unable to hear anyone else's system. I could list out my components but not sure what that would achieve.  Lets assume they're all fine pieces.

what are the things that should be considered when listening and judging an audio system that combines streaming and home theater via bypas thru a preamp.

Maybe it's a great system.