No it isn't... but on the one hand we have a successful coach - universally acclaimed for his tactical nous - starts Sissoko week in week out, and plays him the whole game through, and gets results (top 4, CL final).... which therefore infers that he sees a value in that decision. It doesn't mean that Poch does not make mistakes. Yesterday's first half was one of them; however he addressed his own admitted mistake by a tactical switch which did not involve hauling off Sissoko but switching him to the position which is synch with his strengths.
On the other we have a group of posters whose knowledge of football at best extends to a Sunday league game in the park. who have been ridiculing the player since the day he signed. They seem to claim that a coach of Poch's abilities can, by some unexplained reason (maybe insanity), continue to pick a poor player week in week out without seeing the mistake that he is consistently doing and - crucially - get results in one of the most competitive leagues in the world.
So the question asks itself: Is Sissoko's place in the team because he brings qualities that benefit the team (even though they may not be those his critics want to see) and therefore have been crucial to last season's success... or is it because of Poch's consistent and persistent incompetence in choosing the best starting eleven?
In such divergent situations, Occam's razor is useful tool to establish veracity. So tell me, all things being equal, which is the simplest explanation of the two? The razor dictates that it is usually the correct one....