There isn't a single courtroom in Michael Clayton.....and probably only about 10 minutes taking place within a lawfirm. The film has its own look and dark feel, though if you are married to the idea of something that really needs a "big screen" I'm not sure how you'd feel about it. It's written and directed by the guy who wrote the Bourne films (if that's a plus or a minus). Ebert on cinematography:
"Working with the great cinematographer Robert Elswit ("Syriana," "Good Night, and Good Luck," "Magnolia"), he uses stable, brooding establishing shots, measured editing that underlines the tension in conversations, and lighting that separates the fluorescent sterility of Clayton's business world from the warmth of family homes and the eerie quiet of a field at dawn. "