I was under the impression that the 'flag' feature is for content that is grossly inappropriate (e.g. a Reddit-esque asinine post), not for posts whose content I believe doesn't fit?
That is correct. By that extension, if you are not interested in the content, ignore it. What's actually worse is posting a comment that merely complains about this not being content you think is appropriate.
> Please don't submit comments complaining that a submission is inappropriate for the site. If you think something is spam or offtopic, flag it by going to its page and clicking on the "flag" link. (Not all users will see this; there is a karma threshold.) If you flag something, please don't also comment that you did.