As mentioned earlier, I think much of his game has been about making space for himself - and succeeding. What use he has made with that time and space has been up for debate more than once over the years, but there has been some glorious moments as we all know. Nowadays he's not even able to make that space or pass a man, and that makes him look useless even when he's really not because it's so visible it overshadows the good he does. He's also very good in combination play inside or just outside the box - of which there are nowt these days. Without any of this, he's just another player.
We also tend to forget that few teams are afraid of Kane anymore, the glory days of opponents double- and triple marking him making acres of space for others are long gone. There's no free lunch anymore.