Its not about not liking him.....and he has tonnes of positives (as you say work rate as well as link up play, pressing from the front etc) BUT when the chips are down you sometimes need a goal scorer and GJ has shown over thelast few seasons that the vat majority of his goals are laid on a plate for him (and while this takes undoubted talent with his movement in the box) the best strikers are far much ore than that...all strikers will get those goals from 6-8 yds out if their movement is good enough (and Jesus' is) BUT strikers like Kun, Henry, drogba, Mane make their own goals as well.
Pep in a recent interview whenasked about missing aguero sand he satarted talking about Jesus in connection with this. He said something abou things you have with Kun that you dont get with Jesus and things you hae with Jesus that you dont get with Kun...I think we ALL know what those are:
Jesus - better at pressing and defending from the front. Higher work rate and better link up play (though Kuns has improved massively). Poor finisher in comparrison
Kun - Lethal finisher - will score goals from everywhere. puts fear into defenders......lacks the pressing/work rate of GJ but gives you goals and is much more of a cleaner striker of the ball and when the chips are down is much more likely to grab you a goal.