NWR:
"My major complaints about Nintendo's E3 showings in 2012 and 2013 were focused on a lack of surprise. There's more to it, but when it comes down to it, I look forward to seeing what game companies are creating that I didn't expect. In 2012, the biggest surprise game reveal was Nintendo Land. In 2013, the long-anticipated new Retro Studios joint was nothing more than a sequel to Donkey Kong Country Returns. In the grand scheme of things, really awesome games were shown at both of those E3s. Pikmin 3 turned out to be worth the wait...but we always knew it was coming. Super Mario 3D World was really neat, but it was just an iteration on prior Mario concepts."
Nintendo has recently restored Wii U Mario Kart 8 and Splatoon online after five months of being offline.
Game Rant Writes "Mar10 Day is a fun yearly celebration of the Super Mario series, and Splatoon may warrant a fan-designated day of celebration in its own right."
Bayonetta's character design and abilities have changed a lot since the series debuted in 2009, with new costumes and dark arts in every title.
They really had an amazing show. The only reason I wouldn't say they won is because it remains to be seen if the Wii U can reverse it's fortunes.
Other than that the company was clearly a big winner at E3 2014. They've also proven they're sticking with the Wii U no matter what. Amiibo is a very big investment in the future of that console.