I would say, look at the placement of it's graduates - do they get employed, and in what sectors; if it's in the relevant area (games development), and if so, where and what type of work (temporary contracts, permanent employment, at major development studios/offices or through contracting agencies or at indie places). This might help you evaluate a) the relative quality of the course, perhaps, and b) more specifically, how relevant the course is to your eventual goals/aims.
Some other places to consider could be Goldsmiths (they at least at the masters level have some Creative Computing and Games Design type courses, and I believe have some CS oriented undergrad courses which will likely have scope to specialise in this area), and Loughborough (which is naturally in your area, a very well regarded uni, and has both strong CS/STEM areas and creative/art and design areas, and likely will have scope to allow you to combine the two from either side in a games focused way for independent work like your dissertation/final year project etc). Do look at more general art or computing courses, depending on your specific strengths and interests, as usually you can to some extent focus in on the games area as above, and having a deeper and broader background on one side can be more beneficial than a general familiarity with both, for some roles in the industry. While formal CS courses often require some background in Maths, not all courses do, including some at reasonably reputable universities - such as Cardiff.