If he's a terrible interior scorer, who in your book is a good one, because everytime I see him he is awesome in the post.
I don't think anyone is saying his game is perfect, but for a youngish power forward who is better than him - Paulo, who else? I can't think of anyone.
He is having a down year, if he isn't super happy and Memphis is having second thoughts about his contract that might be precisely why he is available.
He's well below the league average in post shooting percentage. He typically is just a turret, waiting for the ball so he can shoot it.
We just played them and, despite scoring, 19 (on 19 shots), he was basically invisible. He doesn't rebound unless the ball goes straight at him, he makes Ayton seem like a dawg in that department. He doesn't even block like he used to now that Adams isn't there to allow him to roam around chasing them. He can't pass, he fouls a ton.
There is a lot not to like.
And he's basically made zero growth as a player since entering the league. His minor changes in scoring have just been a result of shooting more or less. He entered into the league looking like Serge Ibaka, only with a much higher ceiling and evolved into Serge Ibaka, only bad at rebounding.
He isn't a bad player, but I don't think he's worth his contract, he is a niche guy on a max contract and if we're looking for an upgrade at forward it certainly cannot be a guy who rebounds less than what we've got.