I'm sure you can do better than 'tall and not clumsy' as a description, it's pretty obvious he's a good footballer. I think it's also easily forgotten that he is still only 23 years old. Yes, 23, that's when most 'kids' start playing in Serie A. But like many wonderkids who shine early in their careers maybe he will burn out.
When I say modern centre forward I'm not just speaking about someone who scores 40 goals per season. I'm saying he has athleticism and technique to not just play as a static #9, he can assist, move into wide areas of the pitch, as well as use his size. That he chooses to spend a lot of game being a prick is a different issue.
At 23 Cavani was just coming of age, few would have put him above Balotelli after a dozen goals at Palermo. The same for Falcao moving from River to Porto after a similar tally. Their careers have been on an upward spiral ever since, Balotelli's is probably going in the other direction.
But he's not doing too badly himself in terms of goals. One every other game from his time at City and Milan, the same for Italy, who he has generally upped his game for, i.e. cut out a lot of the crap.