Sony. They have never relied on any one particular franchise to sell their hardware. SCEE gives their development teams a lot of creative freedom.. and as a result we get a lot of unique IP's on their platform, spreading though many different genres. So there is something for everyone. (Oh and Naughty Dog :P)
Microsoft are pretty stagnant in their first party offerings in terms of creativity (and output). I can't think of any other IP they've made this generation apart from Viva Pinata and Kinect Sports. That said, their games sell and cater to their demographic quite nicely.
Nintendo are the true wild card. They haven't made many new IP's since the N64. It all went a bit after the Gamecube and then the Wii.. But titles like Wii Sports and Brain Training can hit it out of the park in terms of sales. Creatively, outside of casual titles they've made last gen.. they are also lacking in that area - in terms of actually producing new IP's themselves.
