Not all that is a part of the US is a reason for its success. Whilst the US does a lot of things well, there is always room for improvement, and some of the aspects of its legal framework is one of the areas that could benefit. The US spends 2-3 times as much on tort as other developed economies; this is clearly a problem, not an advantage.

For more examples, see: http://www.economist.com/node/21541423 - on attempts to reform tort law

http://www.economist.com/news/leaders/21571141-cheaper-legal... - on how US legal education can be reformed to reduce the cost of legal counsel

http://www.economist.com/node/18389167 - on problems with the US' patent laws