If anything PC / Steam pushed online gaming so MS really deserves little to no credit there... sure they did some neat and not so neat things with it, but innovation is quite a stretch of the imagination... People saying MS for online sound like hipster lemmings.

Microsoft, xbox live it made online mainstream with Halo, achevoos gave games more replay value, As for new ips well that's all just opinion i can say MS with Halo and Gears of war but that's my opinion.

Nvidia

Industry design that no gaming companies not even Nintendo are paying attention to now... Don't really get how that us innovation

To me innovation would mean changes that are carried forward with time not changes that are popular for a short period then dismissed

Nintendo with the Wiimote. About the first "online community", well, Nintendo already had the Satellaview back in the SNES, but that's longer than a decade ago.

I wouldn't regard any as being particularly innovative I think all the progress we've seen would've happened regardless
Even using cameras to track movement for games was done line before any of the 3 tried it

Nintendo hands down. Nintendo tries with every console to do something different and FUN. It starts with the N64 with their thick big cartridges and controller, to GameCube and the small compact console and mini disc for the games, onto the Wii with motion controllers and Mii Characters, to now with the Gamepad controller interlinking with the console and WiiMotes. The other 2 have pretty much stay the same with slight tweaks here and there, becoming more powerful, not very innovated IMO

Microsoft innovated the most, but it was all for the worse imo.

Online console gaming was pioneered by SEGA, with Microsoft introducing Live after that, very heavily based on SEGA's online infrastructure.

When they upgraded the Live structure for the 360, they took systems that were already active and popular on PC and just ported them into the system. There was zero innovation here.

The achievements system already existed too; however, Microsoft DID have the unique "innovation" of requiring achievements for all games, and tallying them all up in one account for all games played. But that's most definitely a secondary aspect of gaming.

Nintendo made motion sensing a permanent part of all three console makers' hardware, and I believe also heavily influenced the decision to include gyroscopes and accelerometers in smartphone design. Motion sensing was also not original to the Wii, but the method with which they decided to implement it was, and their influence in releasing motion sensing absolutely changed the face of gaming forever.

Nintendo also created Miiverse, which AFAIK is entirely original, and applied it to all Wii U games. Every game is required to implement Miiverse, though they can do it in a variety of ways, and some really do it creatively. And I feel that it definitely changes the face of gaming on the console a lot more than most would realize.

There's absolutely no debating who made the biggest innovation. The most, numerically, though, is a much more difficult decision, but I still feel it'd be Nintendo.

Anyone who doesn't say Nintendo is just being a fanboy. All due respect to Microsoft for pioneering online, however. They hold a very respectable 2nd place. Even the Kinect was innovative, honestly, though it did little for gaming. Sony on the other hand is a follower, though they often do improve upon things they follow. They're a very distant third in innovation, however high quality their hardware is.