It was quickly forgotten, but I think The Social Network is an excellent legal movie. Most of it takes place in depositions via flashback as opposed to a courtroom, though. Certainly helps that it’s another Sorkinfest.
The Social Network is commonly called the best film of the past decade… hardly ‘forgotten’!
And Justice For All.
“ You’re out of order! You’re out of order! The whole trial is out of order! They’re out of order! That man, that sick, crazy, depraved man, raped and beat that woman there, and he’d like to do it again! He told me so! It’s just a show! It’s a show! It’s “Let’s Make A Deal”! “Let’s Make A Deal”! Hey Frank, you wanna “Make A Deal”? I got an insane judge who likes to beat the shit out of women! Whaddya wanna gimme Frank, 3 weeks probation?”
Lawyers doing lawyerly stuff? Not surprising that there are few movies about people sitting in front of computers reading and typing! 
And, of course, conducting snappy 5 minute depositions! 
One of the most realistic representations I’ve seen on screen was from Better Call Saul, where the associates were in a windowless room doing document review!
But, in terms of movies, A Civil Action w/ John Travolta, Robert Duvall, etc., had many realistic aspects IMHO.
Some less conventional options:
Crime without Passion (1934) – Lawyer with contempt for the law Claude Rains concocts an alibi for himself after shooting his girlfriend. Incredible opening montage.
Man of the People (1937) – Sinister looking good-guy NY lawyer Joseph Calleia rages against the local political machine while finding romance. At one point, he uses a brilliant “gefilte fish” defense and later exposes a gold mining investment scam with a tomato. You know, real lawyer stuff.
A Matter of Life and Death a.k.a. Stairway to Heaven (1946) – Trial in celestial court pits hoarse-voiced neurologist Roger Livesey against hardass Revolutionary patriot Raymond Massey for WWII pilot David Niven’s life. Sadly, no Jimmy Page solo.
Miracle on 34th Street (1947) – Santa Claus on trial!
The Lady from Shanghai (1947) – Dumb Irish sailor Orson Welles gets involved with corrupt defense lawyer Everett Sloane, Sloane’s wife Rita Hayworth, and Sloane’s über-creepy partner Glenn Anders. Features one of the most absurd and ridiculous - and entertaining - trial sequences ever filmed.
The Caine Mutiny (1954) – Naval court martial drama with Jose Ferrer showing up late to steal the show as the defense attorney.
The Phenix City Story (1955) – Fact-distorted, but well-made account of lawyer Richard Kiley trying to clean corrupt Southern town of gambling and prostitution.
Paths of Glory (1957) – French WWI military trial has pre-war lawyer Col. Kirk Douglas defending his men against charge of cowardice after they were ordered on a hopeless assault which predictably failed. Directed and co-written by Stanley Kubrick.
The Outer Limits: “I, Robot” (1964) – Lawyer defends robot accused of murdering its maker.
The Advocate a.k.a. The Hour of the Pig (1993) – In Medieval France, city lawyer Colin Firth heads to the country to practice law and winds up uncovering uncomfortable truths as he defends a pig framed on a murder rap.
More recent Sorkin The Trial of the Chicago 7 on Netflix. Well done.
The older movie, Sleepers (not to be confused with Woody Allen’s movie. This is the one with Brad Pitt, Kevin Bacon, Robert DeNiro), spins a trial about murder to a more sordid past.
Miss Sloane is kind of more about a congressional hearing and lobbying, but it is definitely full of lawyer stuff.
If you like Grisham (The Firm) The Rainmaker, A Time To Kill and The Client have lots of lawyer stuff. Runaway Jury is more about a trial, and not so much about the lawyers as I recall (still fun).
The Verdict has been mentioned. It’s been awhile since I’ve watched it, but I recall a lot of stuff that is common such as chasing down witnesses, expert witness selection and preparation, good cross examination, cranky judge, one side has a lot more resources, and some negotiation. Oh, and dealing with emotional clients.
the lincoln lawyer ?
(the book was good anyway)
If you will accept TV shows, you could try Murder One from 1995. Season 1 was a 23 episode arc concentrating on a single murder trial. It went into great detail with every aspect of pre-trial work, jury selection, prosecution evidence, defence evidence and verdict.
Season 2 was three shorter arcs of several episodes each, much less detail, and they lost the star. Not as good.
Kramer vs Kramer (1979). Dustin Hoffman and Meryl Streep in an ugly divorce/custody case. Further proof (if any more is needed) that marriage is EVIL! 
Not a movie, but tons of lawyering: Better Call Saul
The book was great. The movie really disappointed me. The part where he called on his biker gang clients for protection was so tense and momentous in the book–he knew he’d opened Pandora’s box by accepting a favor, and his sense of dread was palpable. Even though they didn’t end up needing to commit any violence on his behalf, he knew he’d crossed a line and felt rather sick over it. In the movie, it was played rather flippantly–oh, I’m just gonna pop my shades on while I casually stroll away and remind my goons to only beat this guy half to death, lulz!
For an interesting take of Leo McKern (ie Rumpole) behaving badly as a lawyer (Thomas Cromwell) and Paul Scofeld behaving well (Thomas Cromwell), see:
(Both eventually meet the same fate in real life, although Cromwell survives the movie.)
Excellent movie!
As recited by one of the accused when half-drunk:
“There was a young man from Australia,
Who painted his arse like a dahlia.
The sketching was fine,
The colours, divine!
But the scent - ah, that was a failure!”
The Winslow Boy. Probably.
This must be repeated. It is difficult to become a lawyer–it’s not something you do because you led the class in English Lit, or History. As Professor Kingsfield said in the movie, “You teach yourselves the law, but I will train your minds.” And that’s just what happens. As a lawyer who attended a law school which followed the Langdellian system, yes, I’ll agree that you teach yourselves the law, but your professors train your minds.
Watch The Paper Chase, and then watch any other movie cited so far, and you’ll understand why lawyers do what they do.
I saw the movie and then the TV series. Loved both.
Scofield as Cromwell?
I was going to mention this one. I loved the book, but the movie was a little too much like watching lawyers doing lawyery stuff, so not the most interesting movie in the world (imo).
Thomas More. My bad.