I think the thing that confuses me with McBurnie is that he isn't the most fluent of footballers. Or as much as I'd expect, for the price. I'm not knocking the lad, merely sharing.
He appears quite languid in his running style, his feet are sometimes at 6s and 7s and you never quite know if he is going to pull something off, or if he's just trying to get the ball out of his feet. He also seems to scuff the ball quite a lot with his passing and shots, he rarely seems to hit it as cleanly or with as much crisp power as you'd expect.
His hold up play for the second goal against Spurs is a good example of some of this, especially the scuffed ball at the end.
That said, there's definitely a player in there, and I wonder if he we'll see him becoming more 'polished' during his time here.