I can't speak for anyone else, but I never considered these riders as pre-race favorites. The only three I considered as favorites were CF, AC, and VN. The guys you've listed I considered (and they considered themselves as such) as top 10 contenders. That was it. And on top of that I only considered them as top 10 contenders based on them having a trouble free 3 weeks. Several of the ones you named have been involved in crashes, ect.
This is a "weak" field if you think about those who are not here. This is not Nibali's fault, this doesn't take away from his win, but it is a fact nonetheless. Of course congratulations to Nibali for his win, staying upright, dealing with the pressures of the yellow jersey for so long, and winning his 1st Tour. Winning the Tour is not only about brute strength. He had the perfect combo of strength, skill, mental strength, and luck.