Oh come on, it is not amazing! Please use words as decent, good or great - not amazing. Given his price and responsibility, playing as a lone striker for Manchester United with talented players around him, I would say his output thus far has been average to good, certainly far from amazing. 8 goals in 12 matches in the league, goals against West Ham (18th), Swansea (19th), Stoke (15th), Everton (16th), Soton (14th), Crystal Palace (20th) and Newcastle (11th). Goalless against Liverpool, Spurs and Chelsea, in other words scoring against the relegation fodder (which is also a good thing of course, not taking that away from him). What is it now, one goal in eight games? He is no Lewandoswki or Kane.
He scores sitters and has a good presence in the box, he is a decent header of the ball, but he is average in everything else he does. He doesn't sniff chances like Cavani, he doesn't contribute to make others better, his passing and touch is Conference-level, he doesn't score goals "out of nothing" like Kane and he is so slow at turning his body and utilizing his strength and pace. He is fast, but that doesn't help when he is so big and needs time to get going.