As for me, forgetting about the money I spent, I am very happy with the D800. If I wasn't, I would put it aside and use something else. If my D800 fell off a bridge, I would somehow work and scrape to get the $3k for another. I am just that impressed with it. Granted, I have mostly used it on a tripod for landscape photography, but in that regard I think it is outstanding.
As suggested above, if you get sharp images on a tripod and not otherwise, then perhaps it is shutter speed or something else?
I do not consider myself a fan of Nikon or anything else material. I just want to take nice photos, both as a self-gratifying hobby and challenge, and to share with others. That said, I do like this camera and I am having absolutely no problems with focus...auto with the viewfinder, auto with live-view, or manual.