Poll's done and the results are in. In response to the question, "The Best VNs have stories about..." the overwhelming majority of you voted both the main character and the capturable characters. Some peeps elaborated in comments with very insightful stuff.
To be honest, the best VN's I've ever played are almost NEVER solely about the capturable characters. A strong "A" story (that is, the main plot) shouldn't be centered around a couple. That's for the "B" story. Now granted, in this medium, the "B" story can become much more important than the "A" story, considering how important romance is. And to be honest, we COULD care much more about whether Jin and Sayori are going to get together over if Sayori will save the world. But the "A" story has to be resolved first for the "B" story to really pay off.
And a good "A" story needs a good protagonist. So, I guess my answer is that most good VN's are about the main character and his or her journey. However, I think that having a capturable character that has NOTHING to do with the main character's journey is dumb. Why even pick a character if they're not going to change the story in some way? The caputarable characters should have arcs as well, even if they're subtle. Boring capturable characters make for a boring game. And there's nothing more annoying than reading an epic ending of a grand tale that devotes about one line to the character you ended up with. What's the point of getting all the endings if there's hardly a difference between them?
Thanks to everyone who participated in the poll! I was surprised by how many votes there were. O_O I didn't think that many people even read this blog. <3 Thanks you guys!
Expect some more scintillating discussions/reviews. I really want a copy of "Jisei" but ALAS jobless still am I. ;_; Oh well...it'll be on my wishlist...