From the article, sounds like the company founder is a complete bell-end, had no clear vision and kept changing his mind on everything. Half the games developers in Edinburgh probably used to work for Rockstar and will know all the ins-and-outs of developing a GTA clone, but if you keep fucking them around then you'll end up with a mess.
From the reviews, sounds like even when it's not being a buggy mess, it's boring and the plot is completely stupid. You can hotfix the bugs and performance issues away, but if the underlying concept is shite then you can't really polish that into something good.
I think it's in the nature of capital cities that they tend to attract quite a lot of people who want to try "life in the city" for a while and then move on? I've a few friends who moved down to London to see if they could make it in the music industry, which they did not, and then moved on to somewhere else with a less insane cost of living, after a decade or so. I'd observe that, while there's quite a lot of Brits in London, there's a massive shortage of Londoners. When people have kids, they generally want a bigger house somewhere with a decent school nearby, which in many cases means moving to the outskirts, or to a different city altogether.
That's very much to London's benefit, though. They have everything that you can imagine; specialist shops of every variety, and opportunities in every industry. However, I don't think 'London weighting' of wages is really sufficient. Even if the wages are eg. 20% more for doing the 'same job' as the rest of the UK, you aren't going to get a lot for that, and a lot of people in entry-level jobs are going to be living in big shared houses and struggling to scrape by, until they find the experience/inclination to leave. That's a tale as old as time, tho, and probably to the benefit of the city - without a massive turnover of people, wages would probably need to be even higher.
Diversity is strength. If you don't like that, then a bustling metropolitan capital city is not for you, and London is no exception. They've a nice bridge for the racists to throw themselves off; cry while you do, dickheads.