If you can make a court-room battle interesting beyond a single ho-hum check, there's apparently a huge untapped market waiting for you. Billions and billions of dollars to be made on frustrated WoW players who would rather be emulating Perry Mason than Conan.
Well, 'Burning Wheel' by Luke Crane has "social combat" system which works on the same engine (only with social actions, e.g. debate and counterargument, instead of combat ones) as combat does (write down your next three actions, and certain actions have bonuses/benefits against other actions). I've been told that it works really well, and using this system social arguments/court cases are just as exciting as combat encounters.