Yep, there are so many really effective design patterns in Doom's level design that modern games just fail to emulate.
It's funny how he describes monster closets as a great way to surprise the player yet Doom3 received an awful lot of flak over the use of them.
I don't necessarily disagree, but I played it as a kid and my imagination ran loose when I was running around the earth levels. The Hell levels near the end were awesome and the new D2 monsters made it way more fun than Doom.
I played Doom for the first time on my Gameboy Advance. It was censored to get the Teen rating, so all the blood was green. Still, it is the most realistic, fastest, best GBA game I ever played. After I played it on PC a few years later it's also one of the best PC games I ever played.
Oh yeah, I was kind of confused with the term "realistic" being applied to a game where a 60mph walking lone space marine uses futuristic weapons to shoot demons that have spawned from hell itself