I really don't understand why people seem to insist that what Froome is doing is more monstrous than what any of his competitors did. Yes he's head and shoulders above the rest, but that's because they're nowhere near their best performance not because he is supernatural.
Now I know everyone is referring to the last 15k, which were quite quick yes, but they started the climb at a very leisurely pace, not to mention there was a massive headwind.
You should look at the full acent time, which was 59 minutes. If you look at the link below that means he was slower than both Schlecks, Contador, Armstrong and even Kreuziger were in 2009. And barely faster than Pellizotti, Nibali and Wiggins were this year.
http://climbing-records.blogspot.ro/
Basically Froome is riding at the level of 2009 (and probably 2010) top riders. I think anyone looking at Contador and Schleck now can see they're not riding at that level. So I believe Froome is not superhuman I believe others are no longer at the level they were leaving a gap for him.
No why it is that Froome is at the top of his ability while Contador and others aren't could have many explanations, and I don't feel this is the right forum for it.
In conclusion I believe that it's very much the easy way out to say what he's doing isn't normal because of how he's defeating the competition, without any consideration of their level. And honestly I think it comes from Sky hate.
Honestly I started this tour hoping Froome wouldn't win, but this complete and utter hatchet job being done on him is making me support him more and more.