Ocarina of Time is the weakest 3D Zelda game.
I could not get into Skyrim, I found it very bland, dull, and boring.
Super Mario 64 is aged poorly and has become average at best. The Galaxy series, Odyssey, even 3D World and Sunshine, are more engaging, fulfilling, and entertaining.
Pokemon has become very stale and is not as exciting or engaging as it used to be. I find it very hard to get excited for a new generation of Pokemon because it's just the same old shit. It's never going to grow beyond where it is now and will always be 2nd to Mario and may even fall behind some of Nintendo's other franchises unless Game Freak gets off their asses and truly innovates and pushes the boundaries of the series like Nintendo did with Breath of the Wild for Zelda.
Video games and the industry as a whole would still be almost or just as popular as it is today without PlayStation. It just would have gone on with Sega vs. Nintendo, with Sega taking over Europe like Sony has, never leaving the hardware market, and the current big three of console gaming would be Nintendo, Microsoft, and Sega.