The best platformers were the Rare ones - Banjo Kazooie and Donkey Kong 64. Also worth a mention is Space Station: Silicone Valley, which despite a major bug that makes it technically impossible to complete (regardless of the problems it engenders, I think patches for console games are a good thing) was still tonnes of fun and had hours of varied gameplay.
The best multiplayer game, obviously, is Goldeneye. I think it would be disgusting and uncouth to suggest otherwise. Perfect Dark too.
Some of my other favourites were Blast Corps, Lylat Wars (I think that has a 2 player co-op mode, maybe a 4 player battle mode - can't remember), Body Harvest, Turok 2, Rogue Squadron, the Pokemon games (Stadium and Snap)... Probably a couple more - can't remember.
I never played it, but I'm pretty sure the magazine I read used Shadows of the Empire as the yardstick by which all terrible games were judged (that is; "almost as bad as SotE", etc).
No way, I watched my friend play that game from start to finish atleast 5 times. It's a good game.