I will admit that the Goldeneye multiplayer wouldn't be that great.
However, I have a very hard time believing that the single player experience has aged poorly.
There were so many great levels in that game. Sure some were short, but fun none the less.
I remember the Dam level was amazing.
I am curious to play Perfect Dark again and see if that aged well. That game I have a feeling that the multiplayer will have actually aged quite well, and the single player not as much. Perfect Dark seemed to complicate the Goldeneye formula too much.
It was like the story and level progression just got too out there. Again though it had an amazing first level that was intense and enjoyable to play.