We grumble, and I include myself, about the quality issues with Nikon. The D600 is one blatant goof and they have admitted it. But, the vast majority of D4's and D800's are working well, doing the job. Unfortunately, here on a forum, a lot of folks come because they have problems, or in my case because I have no paying job.
But we see a highly biased sample in this forum, most of us love Nikons, hate the troubles if we happen to have some. And, for me, I must remember Nikon is still recovering from two huge disasters.
And, Canon is no doubt very similar in service, etc., and if one is honest and examines the reviews of lenses, Nikon is very much tops. Canon has good lenses, but the ultimate winners are almost always the Nikkors. (DxOMark)
Other than the oil issues and the aperture control during video recording what was wrong with the D600?
I don't think I'll be jumping ship any time soon.