That's like saying Bill Russell sucked at defense. Russell only sucked at D when he faced Wilt. Funny how Amare averaged 38.7 ppg last season when playing the Spurs while Duncan averages 23 ppg a game when he faced Amare. But Amare is the poorer defender...
Considering that Amare shot 55.9% from the field last year, how would him taking shots away from a team full of outside shooters hurt the team? He averaged almost 10 free throw attempts a game last year. The Suns average only 17.7 attempts as a team this season. You do the math.