[indigochill]

There's a YouTube channel called 3D6DownTheLine which has video series of two campaigns using OSE (one in Dolmenwood and another in a popular megadungeon). I can't really comment on how close it fits D&D from 30 years ago but it at least seems like it plays like how people describe old-school D&D (more emphasis on player skill and creative problem-solving).

From just watching a little bit of those videos, I think a significant part of the appeal today is that it's much quicker (thinking mainly in comparison to 3.5 since that was my introduction) to roll some attributes, pick a class, and go. It also makes the GM's job easier because they don't need to worry about balancing skill checks when the game doesn't even have skills.