What I meant by that is that he doesn't use what most people qualify as "best practices" today. At least per the language he uses. If you look at his (or id Software's, rather) C++, it doesn't follow anything resembling standards in that area. They don't use design patterns, there are straight C (stdio, for example) calls in C++, etc.
I'm not saying that's bad. But it's obvious he doesn't keep on top of trends that well. Or languages, for that matter.
I'm not saying that's bad. But it's obvious he doesn't keep on top of trends that well. Or languages, for that matter.