I'm quite new to the site and one mechanism is rather unclear to me.
The Help system clearly states
Voting up a question or answer signals to the rest of the community that a post is interesting, well-researched, and useful, while voting down a post signals the opposite: that the post contains wrong information, is poorly researched, or fails to communicate information.
There's also the whole section on How to ask a good question
On the other hand, there is the "starring" subsystem for Favourite Questions. And there have only been 2 "Favourite Question" Badges (Question favorited by 25 users) handed out to members.
While browsing through the questions, it seems that Up-Voting is often used to nominate a favourite question, for example, the high-scoring question "Is Thor the only Avenger that can't die?" has 61 Up-Votes, but the question is clearly not excellent quality (1 sentence, no hint of background research, etc.). Hey, I certainly think it's an interesting question, but the quality of the question does not seem to warrant its score.
Based on the info in the Help files, I've been Up-Voting questions that are well thought out, whether I have any interest in them or not, and starring questions that I want to think about, or find later, or find interesting.
So is the system being used incorrectly by the majority of the community? Or am I misunderstanding the purpose of Up-Voting vs. Starring? Is meeting the (somewhat nebulous) criteria of "interesting" (without being "well-researched, and useful") good enough for an Up-Vote?