I don't really want him sold either (of course, in a fantasy world if you told me that I could straight exchange him for someone like Bale, I'd probably do it.) That doesn't change the fact that he's been at best, above-average this season (and that's being generous.) I was thrilled with his first few games here (I even went on Facebook and bragged that we'd signed a top-5 player in the world...) but he hasn't come close to replicating that form since, even when played in his correct position.
We can keep making excuses that he's being let down by the poor performances of his teammates, but then we could also flip that logic around and say that he benefitted immensely from the superior performance of his teammates at Real. Instead, I'd rather judge him on the merits of how he has actually played, particularly with regard to aspects of his game that he has direct control over, such as final ball, shooting and set-piece delivery, and on all those counts, he's been very underwhelming.