It's an adequate fee even discounting the TV money. Xhaka has a clause in his contract which allows him to leave in 2017 for €35m, so obviously Gladbach will ask for a premium in the last window they can freely negotiate the fee.
One of the best CMs in the Bundesliga, CL and EL experience, captain for both club and country, younger than the likes of Wilshere, Campbell or Elneny. £35m is about par in my opinion