If Nintendo went 3rd party, I wouldn't have to contend with their sucky hardware and lack of now standard system level services (steam, xbo, ps4) like notifications, friend list invite/join, voice party, video capture/share, etc
I also wont have to contend with crappy gimmick controls like needing to use Gamepad in Pikmin 3 or lack of Headset support when playing with Pro Controller.
Bottom line, the Nintendo games I enjoy most work perfectly without any of their gimmick controls and would work just as well (if not better) on competing console hardware. If Nintendo were 3rd party, all it would do is remove the barrier of having to buy Nintendo hardware to play Nintendo games.
I hate Nintendo hardware, but I like Nintendo games (some, not all. I am not a Nintendo die hard that buys all of Nintendo crap just because it Nintendo).