I like Jonnu. He works hard, is tough, is a willing blocker, makes plays when he touches the ball.
I think the regular complainers would still be complaining even if Jonnu was producing at a higher clip. You know the type -- they just complain that a given player isn't fulfilling some arbitrary metric of "success" based on contract and production, but they cannot tell you (with specific numbers) what acceptable production looks like to them.
To me, it's much more an issue with usage than with performance.