Incidentally, if you chose "Not Guilty" you didn't 'get' it. The entire point of the case is that Phoenix is learning that the truth must be found and justice must be done. Hell, the name of the game is 'justice for all'! Matt Engarde is guilty, he should get a guilty verdict, end of.
I thought picking Not Guilty got Engarde quite a bit of deserved justice, actually. And considering the game as good as says right before that either choice is fine, I would say that you are the one who didn't get it.
Didn't really like 2-4 that much, myself. Good, not great.
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"As the size of an explosion increases, the number of social situations it is incapable of solving approaches zero." -Vaarsuvius, Order of the Stick