To call him a 'poacher' is probably not right, that suggests a strict centre forward who stays around the box. He's never been like that, but because he is tall he has often played there.
He has a bit of everything; size, speed, a decent touch and dribbling, but he's essentially a mobile goalscorer.
With Gilardino there the problem is that he will always be the second reference point for the striker position, with Diamanti withdrawn.