there will always be failures of some sort across a forum like this. Yes the ones that do have something break, will let it be know, but that said, this bike takes a crap load of abuse, and does great.
in my 35km the following happened:
-fork seal gone at 12km (before I installed fork protectors)
-Steering head top nut was loose (undid it with my hands, should be torqued to 90 ft-lb, guessing a dealer prep oversight)
-fuel pump o-ring recall
-burnt headlight harness (found it while installing my hid kit), easy fix though
-35xxx km the final drive seal let go on me, I did drive it for about 1200 km before it got really, bad, and then fixed. Not easy if you don't have the right tool but doable just the same.
I stock a set of final drive seals (shaft side, not wheel side) otherwise, some oil filters are on the shelf, ::013::
If you maintain this bike, it will go for ever. The above to me are considered minor, based on the crap I put this bike through.
most of the above are on my blog:
http://thetenerist.wordpress.com/2013/10/01/tenere-headlight-issue-clarification/