Can LA Lakers Defend their Championship this upcoming 2010-2011 NBA Season?

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LA Lakers won the NBA 2009 Championship after defeating Orlando Magic during their best of seven series. However, i am quite curious if they really deserves the championship? I doubt that because Orlando Magic was not a favorite. I think Boston Celtics and Cleveland Cavaliers are much stronger contender against LA Lakers. If Kevin Garnett was in shape, and if Lebron Cavaliers and his teammates able to guard the 3 point shooting of the Orlando Magic, it would have been either of these two teams fighting against the Lakers. Plus, the Magic was not as good in defense compared to Boston and Cavaliers, and i do believe that even the Lakers are not as good as these two teams in defense. So I was in big doubt if the Lakers can defend their title this upcoming NBA Season. Do you guys have any idea?