Put it this way, He ended up the 6th highest goal scorer in the premier league, but will cost far more than any of the players infront or around him.
16 goals behind salah.
14 goals behind kane.
5 goals behind an aging aguero.
4 goals behind the mighty vardy.
2 goals behind sterling who is a winger.
1 more goal than firmino who isnt really a number 9 and contributes more than probably all strikers in the premier league (work rate etc).
And he cost far far more than any of those players.
It's not to say he is a bad striker, it's just he isn't as good as his transfer fee or hype suggests. the guy is a bully. simply a better version of benteke. United will probably bin him off when mourinho goes, because he doesn't suit the expansive style of football that is being adopted by most clubs these days. Most clubs simply don't play with a battering ram forward any more.