Meh it's easy to care about another person's character if you're invested in that person. If my best friend gets involved in a D&D campaign, I'm genuinely curious what he's playing, and if he has any backstory for his character, I'd like to hear it.
What I found difficult to care about and found myself skimming, was Yahtzee's detailed backstory for his smuggler... but then, I usually skim those parts of these articles. I like his commentary on things for which we have common experience (games), but his inflated view of his own creative skill and the presumption of our collective interest in it is a bit of a turn-off to me.... particularly when he openly admits to not showing others the same attention and interest he expects from everyone else.