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Duke Has World Class Faculty...
Duke has world class faculty. They expect you to be responsible for your work-- you are no longer in high school-- yet they are all very responsive to questions; they want you to succeed. That is not to say that there are some more 'lack luster' professors out there who don't fit that mold.
If you are interested in Public Policy, Engineering, Economics or Medicine, Duke has extremely strong programs. Then again, I personally lean towards the humanities and social sciences and am still very content with the offerings.
The workload differs from person to person, however the general consensus is that being a Duke student means having to do work (especially if you are an engineer or pre-med). Then again, if you got into Duke, you can probably handle it.