There is so much to choose from and I think many of us on this list have offered our own critique. Also part of the origin of the legal realism was a critique of law school.
But for a classic take, influenced by marxist existentialism among other traditions, try "Legal Education and the Reproduction of Hierarchy: A Polemic Against the System" by Duncan Kennedy. http://www.amazon.com/Legal-Education-Reproduction-Hierarchy-Critical/dp/0814748058/ref=sr_1_1?ie=UTF8&s=books&qid=1219078452&sr=8-1
Kennedy has his own website where you can download his papers but I am not sure that this long essay is available there.
It's a wonderful read no matter if you are interested in Law School or not. Generally it is a take on how the ruling classes and its intellectual elites make sure they keep on going.
Jerry
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