I think when he arrived he had a ton of potential, and indeed started as one of our best players. Whether its being played out of position, or the injuries, he simply hasn't fulfilled his potential. He does the odd spectacular thing (goal against Man Ure for instance), but I don't think his all-round game is up to inclusion in our strongest 11.
I'll trust Roy's judgement though...if he thinks he'll make it, I'll give him the benefit of the doubt.