I can differentiate between good wine and poor wine. Price isn't always an indicator.
We have consumed some very very good wines in Portugal that were inexpensive by most peoples standards.
For a special cellebration we consumed a $700 bottle of wine followed by a $70 bottle of wine. The second bottle was prefered by each of us.
In good seasons sometimes good wine is put into casks and some cask wine can be reasonably good.
Absolutely ! the taste and especially when you swirl the wine in your glass to air it, the viscosity of the wine , in other words the speed in which it settles around the glass will tell you. The slower the better the wine and the better the expensive it is.