I don't think anyone was expecting a spectacular passer, but I think we're fully entitled to expect him to carry the ball 10, 20 or 30 yards out of defence and then distribute it to our attacking players. This is part of the reason he was so good for So'ton, he wouldn't just stifle opposition attacks and press/tackle/intercept. He would relieve pressure by carrying the ball forwards. Someone posted a video of him against Man City when we signed him where he was often moving past Toure into the space in behind which opened up space in their midfield.
This is what I'd like to see more of, I'm not suggesting he turn into a 25 year old Paul Scholes, just that he carry the ball a bit further when the opportunity presents itself. Hopefully this is just a confidence thing, whereby he doesn't want to make any costly mistakes so early into his career here.