He's possibly even better than the figures suggest, absolutely invaluable to the team. So far this season he's basically Giroud with pace and better finishing, wins a ridiculous amount of headers and very nimble feet for a guy of his size. If you think I'm exaggerating - he's both top scorer and top assister in the league (before the last two games he was even tied first in Europe with Neymar), he also leads the league in duels fought, duels won, aerial duels fought and won.
He had a good start to his Eintracht career last season but fell off a cliff after the turn of the year, but even when he was scoring he seemed awkward and was not really in sync with his team mates. Now he looks like a completely different player, regularly bullying two centre halves by himself and Jovic and Rebic play perfectly off him, he's massively helped by the far more attacking style of Hütter compared to Kovac too.