Boiling what a critic says down to "good/bad" or "like/dislike" means the reader hasn't taken the time to really understand what was said-- or the critic wasn't very good.
Your friend might be too humble.
Some things you get more out of if you choose to spend time with them, but will in turn change your own sense of it, and the experience you are having.
So in some sense you actually do become "better " at tasting/listening well - or at least you become more sophisticated. Which doesn't invalidate the enjoyment that someone else can get from a more superficial engagement, at all.
I'd expect critics to have eaten enough where they can judge many things.
I do agree putting it into words so someone else could have a sense of what it would taste like and possible be able to say if they would like it.
Personally I like it.
"This critic knows more than me, and tends to like merlots, maybe he'll suggest a reason why I like it, or a new wine that I'll like as well". Of course, taste is subjective, and that may never happen, but it tends to give people an idea of what wine/vidoe-game/comic they want to try next.
Critics are just people with opinions. Sometimes they can provide good justification for why whatever they're reviewing is good or bad. But not one of them is impartial enough that their opinion can be taken at face value, specially if you're not into the stuff they're pushing.
This is more obvious with film and videogame. It wouldn't matter at all if a critic I liked ever said that there's this one Adam Sandler movie that everyone should totally watch. I'm not into that crap.