I'd say it is quite opposite, a deep understanding of what you like and consequently understanding what will make a creation into exactly what you like. (Well I guess some people can create without understanding, just directly expressing their likes)

Since many of our likes are driven by our shared culture and physiology, many other people will appreciate such creation (even if they don't understand why exactly they like it). Others will appreciate depth of nuance and uniqueness of your creation.

Opposite to taste is approximated "good" average which is likeable but just never hits all the right notes, and at the same time already suffering from sameness fatigue.

It's subjective in the philosophical sense (the subject of the predication is involved with the judgment itself) but that doesn't mean it can't be "right" (and probably more importantly, "wrong").