We can't just bin everyone who doesn't work out in the first season. Baines didn't get much of a look in the first year he signed, should he have been as quickly branded useless? We can't afford to keep spending possibly buying another 30M player that could have the same issues.
Bottom line is most foreign players have issues adjusting and more to the point we are not getting the best out of him with how we play. He was good enough being a captain of an Ajax side that got to the Europa league final, there is a player in him. Some players you don't ask to tackle everything in sight, if we had bought Mata would we be expecting that? We have to play to his strengths, look at what he does good and play and organise a team to compensate for any weaknesses of one individual player while trying to enhance all the positives. We haven't got a manager who can do this yet.
He needs a run of games where the team go forward to see if he has what it takes.