Michael, I see what you mean regarding popularity. It's definitely very spurious to try to cite it as evidence that one is better than an another. In my sidequest about 2001: A Space Odyssey and The Good, the Bad, and the Ugly, which are films of probably comparable artistry (though, of course, one's themes are far more profound that the other's), I mention specifically that the films are recognized fairly equally by critics. I wanted to show that popularity was dependent on goodwill, not that quality was dependent on popularity.
As for the adventures/first-person-shooters, again, I love adventure games - but as Thomas observed, I usually play them with walkthroughs, which feels substandard. You can't really immerse yourself in the story when you're tabbing over to the walkthrough every twenty minutes.
One question about popularity, though: if we create art to communicate and elucidate, and we value that our art communicates to people (for whatever reason), mightn't we have moral (so to speak) obligation to reach as many people as possible? If we believe our art adds value to society, oughtn't we to strive for the greatest value possible? Or is the argument that making it accessible dumbs it down to the extent that the net value is decreased anyway?