He's a decent rim deterrent, but more a positional defender about being in the right place with his hands up rather than jumping and chasing. He used to block more shots, but he also fouled a lot more. His improvement over the years has been not fouling but still playing good defense.
15-16, his first Euroleague year: per 36: 2.23 blocks, 8.53 fouls
to
18-19 per 36: 1.37 blocks, 2.01 fouls
And his defensive impact is way up. He's 5th in the Euroleague in defensive rating. ORtg 133.7, DRtg 105.7
1st in rebounds, 1st in rebounds per 36 pace adjusted also
5th in PER
He is a screen setter, rebounder, rim attacker. He's so effective with his dunks not just because it's lol-euro but due to his strength, he makes himself available to the pass, and he can corral poor passes.
He's no minimum player.