Considering we have him, and he's been injured a few times, and he will always take gametime to get his sharpness, surely we should be playing him a little more than we are?
I was deeply concerned when United signed him. He is small in stature, relying on ferocious appetite and physicality. Rooney was the same (and I know there were also other fitness issues, but it stands) - it's very hard for smaller players to keep that ferocious dynamism into their late 20s. No, Messi isn't a fair comparison, he is different. Sanchez had spent 18 months at Arsenal looking increasingly frustrated with others while actually not producing as much himself.
However, surely we should be seeing him on the pitch more than this, given that other players haven't been performing.