The N64 was easily their worst and it started the downfall of Nintendo as the dominant brand.
I was a diehard Nintendo fan and remember not even being that impressed when I saw Mario 64 at Toys R Us. I was into PC gaming after the SNES and PC was already doing more interesting things with better graphics. I was also letdown with how the N64 was promised to basically be a home SGI machine with the exact same graphics as Killer Instinct in the arcade.
They stuck with carts and charged huge licensing fees which drove 3rd party companies away. The controller was also polarizing and just didn't feel right unless a game was as specifically programmed for it.
I think if you are in your early 20s, you are incredibly nostalgic for the N64 since that's what you grew up with. For me, I grew up with the NES and that's what I'm nostalgic for. I make no bones about the NES being the best just because I think it is. Likewise, if you look at the N64 objectively, it certainly broke a lot of ground for console but I think the long term impact it had on another Nintendo was extremely negative.
Who hurt you?