This drama is brilliant in many different ways.
First of all, the characters are what make this series exceptionally great. Komikado-sensei, the attorney that never lost a single trial, surprises you with his witty and fast speech, and even if sometimes he comes across as incredibly rude, what he says often ends up being wholly or partially true. I definitely agree with his opinion about the countryside, to be honest. That's just an opinion, though. His mannerism is also hilarious and makes him unique and entertaining to watch. What surprises the most is the character's backstory. I do not intend to spoil it.
Mayuzumi-sensei, the Asadora Heroine as Komikado-sensei calls her, is truly a heroine. [From Wikipedia: Renzoku Terebi Shōsetsu (連続テレビ小説, "serial TV novel"), also known as asadora (朝ドラ, "Morning Drama"), is a serialized Japanese television drama program series broadcast in the mornings by Japanese public broadcaster NHK. Virtually all of the storylines center on the life of a female heroine who faces challenges while working to achieve her dreams.] She is always trying to put justice above everything else, and it's primarily thanks to her that the customers are happy in the end. She is also as stubborn as Komikado. This fact makes them continuously clash in amusing ways. It was interesting seeing her growth as an attorney and as a person during the series. I think she's the one that delivered the most profound values in the show. She is also incredibly sweet, which is the exact contrary of Komikado, who can be extremely mean.
The main antagonist, the Miki Law Firm, is a particular one. The mannerism of the people in it makes it feel like an exclusive club, which you belong to only if you stay successful. What makes the audience laugh is how defeat is handled, as it's common for the firm's lawyers, because they're against that one attorney that is never going to lose. The boss, Miki-sensei, is always trying to beat Komikado with his own employees, and is also always acting exaggeratedly angrily when he loses. His secretary Sawachi is probably the most mysterious character in the show. She is often shown massaging Miki-sensei in order to calm him, and with her calm attitude she was probably put at Miki-sensei's side in order to counter his negative traits, like Mayuzumi for Komikado.
Secondly, the single storylines are amusing and you can never guess how they will end, even if the point of the show is supposed to be Komikado-sensei never failing to win. They become more unexpected as the show progresses. It's never so easy to win.
Lastly, the ost is a good one, especially the phrase "Legal High!" that is used in the most glorious moments of the show and at the end of the episode. I can't really describe how, but its rock feel really fits the tone of the show.

There would be a lot more things to talk about, but long story short, watch this. It won't disappoint you.