This is just facepalm-inducing. Even if you want to rate him solely on finishing, he's been the third most clinical finisher in all of Europe over the last six years (above CR7, Lewa, Ibra, Salah, Aguero, Auba, Benzema, Suarez, Neymar, Cavani, basically name a player who isn't Messi). And one of the most consistent too in that his reduced goalscoring over the last two seasons is a direct result of fewer chances (and injuries) rather than a lower conversion rate.
If you care about other aspects of the game, he's at least a solid 7.5 in all of them (except probably raw pace). His passing is sublime for a striker. Just see today's game, or many of his performances for England since the WC (where he's been playing as a sort of 9/10 hybrid).
I may be a little "biased" in the sense that I love Harry but it also means I've seen every game he's ever played in, so I've seen tons of stuff that never makes it to highlight videos.