It's funny, while ADP has never fully satisfied the desire of the Azzurri supporters (or the neutrals, or the haters), he is what, top 5 in all time goals for Italia? Had he buried one of those glorious chances in 2000, Italy would have won, and nobody would be talking shit about him. It's the difference of about an inch, when striking the ball. If you're a Euro winner, a WC winner, and top 5 all time in Azzurri goals, than clearly you're a key player for championship teams.
I get your point, many make it, but it's really interesting how small the margins are in discussions like this... Sports are funny like that.