I don’t think it is any more jarring than the varied entertainment topics in CS.
Most of the various entertainment stuff in CS is at least loosely connected. Sports and Videogames are almost arch-nemeses- most people who aren’t SDMB members with a serious interest in those things tend to be interested in one but not the other, in my experience.*
*See disclaimer in signature 
Loosely connected? What to movies have to do with cooking? What does cooking have to do with painting? What does literature have to do with juggling?
Sports and videogames are much more related - they are both competition endeavors. So we could call the place “The Competition Endeavor Facility”. Or, “The Game Room”, for short.
I agree from the opposite perspective. I started a thread several months ago about getting live actions sports separated from the video game, virtual game type discussion. The thread raised a bit of a raucous but didn’t resolve or change anything.
I would love to have a forum devoted to discussion of active sports (I’m talking about sports that require actual physical activity beyond a computer screen). The participant of this board are, on par, more intelligent and literate than the participants on most sports boards. I’d love to have a place to go on this board for those discussions. Too many of the sports discussion boards are filled with morons. The active sports threads in the Game Room are quite civil and informative. Myself, I have hardly any interest in computer games and that sort of activity. If it all has to fall into the Game Room then so be it. I’ll live with it.
People who are interested in one are (IMHO) more likely to be interested in, or not adverse to, the others. People watch movies while eating a nice meal they prepared. Cooking can be an art form, like painting. People who like reading are possibly interested in quirky things like juggling, for example.
People who are seriously into sports are not generally also seriously into computer games, and vice versa, at least in my experience.
Gaming isn’t a competition based endeavour in the same way that rugby or cricket or football are. I’m not saying one is inherently better than the other, just that I really don’t think they’re actually related beyond “recreational activities”- and as other people have mentioned, the trend towards games nowadays is towards telling believable and engrossing stories, akin to a book, movie, or TV show.
My view is that computer games have far, far more in common with movies, books, TV, and paintings than they do with most sports, which is why I think they’d probably be better suited to CS - if, for discussion purposes, there was some agreeable way of separating “Worthy” computer games from “generic” games. Since there isn’t, the situation we have now is still acceptable- not ideal, but good enough, IMHO.
I don’t think video game threads being segregated from CS is bad, I think an unpopular movie, at least, is going to get a lot more hits than an unpopular game on this board. However, it does make some threads problematic. There’s not a 1:1 population crossover of video game posters and movie posters, so if you’re looking for a recommendation of something with <x> you first have to decide whether you’re more interested in playing it or watching/reading it, a choice that shouldn’t necessarily have to exist.
That said, basically every other forum I’ve ever been on segregates video games and other media (usually to an even finer degree than the SDMB, often there’s a game forum, sports forum, cooking forum, movie forum, etc).