Apparently, 4 out of the 5 uses of this tag were by me, so let me try to explain a bit of my thinking:
<hr />

My interpretation was that questions tagged [game-info] pertained to factual, embedded data of a game that should in **no way** be subjective at all and therefore should not differ from answer to answer.
<p>For instance, the difference between certain weapons (in terms of damage, effect, range etc.) as opposed to how to *use* each of said weapons.  The former question has answers that can be quantified specifically as part of the games mechanics, whereas the latter question is more subject to player experience, although it can still be answered.

<hr />

Let's imagine for a moment that our fair site has grown to epic proportions.  So epic, in fact, that a simple search for [superawesomefungame] and [weapons] turns up 271 answers.  Now say that our user is looking for information on the weapons themselves; not *how to use them*, not *where to find them*, not *how to make them*, but a list of *what they do* in terms of things like

 - Damage
 - Range
 - Effect

Etcetera.  Not wanting to skim each and every question that comes up, the user merely looks for the [game-info] tag, and instantly knows which question he needs to read.