How do I know if my systems any good?

You are right...

I only say that it was not necessary to look for audible defects, they where in front of me without even asking me to look for them...

I am a perfectionist for sound, bad sound destruct my experience..... But one day i reach my goal... After that upgrading is neurosis because "immersiveness" is not only a subjective experience but also an objective acoustical definable set of conditions which we can work to realize ... For me it is accomplished...

@mahgister : "Why work on finding fault with your system? A great use of time is finding more music that you enjoy."

Because we’re perfectionist and need both - great music material and even better system sound. When you love what you do, it really is not work.

If you turn your system on, close your eyes and say "this stuff sounds really good, love the music". You have reached audio Valhalla without all the violence.

@mahgister: Well, assuming that the sound perception is personal and subjective:

What would be the point of discussing sound systems and good sound in general if everyone has different opinion and sound preference. And how do we explain the fact that most of us agreed when it comes to good recordings, good music venues around the world, good symphony or musical performances in general, good hi-fi shows or bad ones? Obviously, we hear and perceive sound in a similar and uniformed way. On the other hand, I agree that we have different preference in music genres and that might well influence the overall expectation of one"s sound system performance. However, that should not be a major factor when it comes to a good objective sound perception of music. 

Take time with what you have; not only your gear but your ears. Move your speakers around. Look into placement theories. I found the Vandersteen method worked for me. Make sure you can get everything out of what you have before you make a change.