"Objectively speaking" about a matter of taste is always improper.
There may be objective qualities that have statistical correlations to people's "good/bad" assessments, but that doesn't stop "good" and "bad" from being subjective.
I just wish everyone wouldn't try to taste like Starbucks, now. They can't do it half as well as Starbucks does, so you just get worse everything.
When I travel, I look for Starbucks. It's just the safest bet to know I'm going to get work done that day.
To me they are like Wendy's. Yeah, not the best, but not bad. I can do better at home or if I know the area... but that's not always the case.
Anyway, I live in NYC and as you said, there are plenty of local coffee shops with awesome coffee (Gregory's, Kaffee 1668, grounded), so I can't complain. But it'd be terrific if Google could support these better coffee shops instead of just following the masses, because they provide a much better experience.
Interestingly, Italians, from what I can tell, are not "coffee snobs" at all. They drink espresso, cappuccino, macchiato, etc... and just expect it to be pretty good, but I've never seen people discuss it much, like you might with wine.
I don't drink the stuff at all, so have no opinion on the quality anywhere.