So now the Nintendo Curse. There are three parts to this, so stick with me.
The first one is Rare. It's the simplest. Rare made games with Nintendo, some of the best and most creative in the industry, but when Microsoft bought them out, their first few games were decent or remakes, but nothing notable. Now it's just Kinect junk and collections of their old games. They have that fighting game, Killer Instinct, but I don't know enough to say if it's in the competitive scene.
Second curse, the most notable, is the creator of the GameBoy, and also, the Virtual Boy, Gunpei Yokoi. He left because Nintendo basically sat him at an out of the way desk job because of how badly the Virtual Boy did. He went and made the Wonder Swan, which was similar to the GameBoy but an improvement. It was quite popular, but the Gunpei ended up being run over by a car with no witnesses. Quite eerie. Maybe it was the yakuza? Either way, his was the most tragic of the three curses.
Now we get to the most fucked up one. Silicon Knights.
They made two games with Nintendo. Eternal Darkness: Sanity's Requiem, and Metal Gear Solid: The Twin Snakes. Regardless of opinions, these were huge for both Nintendo and the developer. It put them on the map, and Eternal Darkness still has a following.
They left Nintendo because they didn't like the Wii, and wanted to make their cross-media movie game things. They went and made Too Human. Long story short, the game sucked, the devs sued Epic for purposefully not finishing the engine before Gears of War released (but still licensing it for development) and ended up losing so bad in court they had to delete all the code from both of their games made in the engine (the other was an X-Men game. According to Denis Dyack, the man in charge of the development team, that game was a mess because Marvel got bought by Disney and Activision had no idea what they could legally do due to licensing. Denis Dyack is important, but we'll get to that later.
So the developer dissolves and a new one rises in their wake, titled Precursor Games. They have a kickstarter to try and raise funds for a spiritual successor, Shadow of the Eternals. The first kickstarter wasn't going to make it, so they cancelled it to work on their pitch for it.
Around the same time, one of the head people of both companies, Kenneth McCollouch, was in a bit of legal trouble. He might be known by some more hardcore gamers. He created Legacy of Kain, and laid out the groundwork for the story.
He was arrested for child pornography.
So he was effectively erased from the developers website altogether.
Combine their previous financial issues, the new legal trouble with one of their leads, and the media constantly smearing them as a horrible developer, I'm surprised Denis didn't kill himself. He formed another studio for multi-media stuff, and he did an interview a bit ago about being pro-GamerGate. The media didn't even listen to his side of the story, they went with anonymous sources instead of hearing allegations and collecting evidence.
So tl;dr the Nintendo Curse is 'don't forget, you're here forever.'