I basically agree with the assesment of Gigs, but I'm a little more generous: 7
Given the region they start in, it's hard not to have at least 2 pan flat stages in the first 3 stages in line. The second stage, however, could have ended somewhere around Mont des Alouettes (2011) or le Puy du Fou. At least it could have had some hills in the final. I also would have swapped the TTT with a short ITT (10-15km).
The two stages in Brittany are good: the stage to Quimper seems a bit harder than the stage to Boulogne in 2012, let's hope it delivers and the stage to Mûr de Bretagne will definitely see some action in the last 20km. But I think those 2 stages will end in reduced bunch sprints.
Next are 2 flat stages. I was a bit disappointed after Alençon fell off as finishtown and was replaced by Chartres, but the stage to Quimper is probably better than a stage to Alençon could have been. We can only hope for heavy crosswinds during those stages. The cobbled stage seems a bit short and lacks an extra hard sector in the final, but it will sort out the field big time. Even the easy and few sectors during the cobbled stage in 2015 saw decent splits. Sectors like bersée and Camphin-en-Pévèle will have a big impact on the race (if they aren't cancelled because of rain, like in 2014).
I like the design and pacing of the first 2 Alpine stage, but the difficulty of the stage to l'Alpe will block them.
Although the stage to Valence could be a lot harder, I guess the second week needed a flat stage and I can live with it. Stages 14 and 15 are traditional medium mountain stage, which can deliver,but probably wont (except the Côte de Croix-neuve).
I like the first Pyrenean stage and don't know what to think of the second. It's too short, but brutally explosive. The flat stage to Pau is meh, but i rather like the stage to Laruns. The final itt should have been a dozen km or so longer, while maintaining the hilly course (It's not even that hilly, rather rolling).