A specific, discoverable tag like quake is a good thing. This is also consistent with our habit of tagging questions with the name of the work, or of the writer for written works.
(It used to be that tags with a single question were automatically deleted after a while, but this is no longer the case, so there is no reason to eschew good tags.)
Tagging with media is also useful, because many people are specifically readers, or movie aficionados, or gamers. In an ideal world, I would support tagging every question with the medium that applies to it. However, it is unrealistic to require a constraint like this on every question, and the tag engine doesn't support making such tags compulsory or even strongly recommended. Furthermore, there would be a very large, unwieldy number of questions tagged novel or movie. So I don't push for systematically using those tags. Instead, we mostly use them to distinguish questions about movies and written works in the same franchise.
The situation with video-games is different. It's a more specialized interest: there are gamers who are interested in the background stories of video games (which are often SF) but aren't frequent readers or moviegoers. video-games has 11 followers — not much, but not insignificant either. So I'm in favor of keeping video-games and continuing to use it.
The ideal tagging for a question like yours is quake video-games.