The Legend of Zelda: Four Swords

Four Swords tweaked the Zelda format towards level-based, action-oriented co-op gameplay, and thus abandoned the series' main strength.

Fun fact: this was the first game I ever beat as a kid. Even though I had played Fire Red, Ruby, Wind Waker, Ocarina of Time, and a couple other titles here and there, I always managed to wimp out towards the end (with Pokemon quite literally before the elite four), or let my dad take care of the games. But with this game I distinctly remember sitting in front of our tiny little tube tv in my dad's office with beads of sweat dripping down my face as I guided four tiny links to vanquish the world of evil yet again. And it was fun.
But now, all these years later with so many other games under my belt, I try to come back and I just can't. I get past the first level and I'm just bored. It feels like Capcom was just trying to sell you shit (more gamecubes, connectors, even a completely different game), while just gluing some old ideas together (A Link to the Past, Minish Cap, a couple other handhelds), and it just aged poorly. Its really sad, too, because I remember having some really fun times with this game. I used to play it hooked up to a tv my parents had installed in the car so my sister and I wouldn't kill each other on our cross-country roadtrips.
If you're into Zelda, for sure play this game. But if you aren't invested too much into the idea of completing every game in the series or learning the lore, I'd say pass on this. It obviously has the capacity to be fun, but there are better versions of the idea out there, even within the franchise.