He should have enough opportunity during training to get at the very least his first touch sorted and basic passing in line with the other midfield players.
Even compared to players that have played relatively equal minutes to sissoko do not split opinion as much and it's no coincidence that people like myself simply have not seen what you or others may. I do however respect others views, but no one can come out and say that he has done even the basics right.
I agree to your point of view to a degree hence i currently defend Janssen. Although his goals have been a little thin along with his playing time, he has shown me that he has the potential to make it happen for him. He strikes the ball clean, takes up decent positions, and more importantly tries his bloody socks off.
Sissoko however looks tired coming off the bench. He is actually paying like a player currently going through the motions on his way out in the summer.