LogFAQs > #979844632

For your consideration:

F-Zero X - True 60 fps gameplay on a console known for most games running at <30 (and as a fast paced racing game it actually needs all those frames)
Pokemon Stadium 2 - All of the Transfer Pak stuff plus some of the top of the line graphics and animations on the console. Also had mobile connection support on the JP version ("online" before wifi). Oh and also consider how much full voice acting the game has (the narrator has at least several hundred if not thousands of unique lines).
Donkey Kong 64 - Don't forget that many of the reasons why people trash this game are a direct result of the devs trying to push the specs to their limit (past it, really). Really just trying to make it as technically impressive as possible to the point where you could argue that they should have delayed it for the GameCube instead.