The graphics in the game look amazing, and the fact that they were able to perfectly convey the same type of expressions and movements as the old 2D sprites in the Art Shift is awesome in and of itself. And if that wasn't enough it looks incredibly good in 3D and is one of the best-looking and best-animated games on the system.
The first time the player sees Revisualization, this will probably be their reaction. You thought the series had a penchant for Mundane Made Awesome before? You aint seen nothing yet.
Any time our lawyers are trying to think outside of the box and reverse their logic. Most of the time, the player get this "Euréka!" moment as "Revisualization ~ Synaptic Resonance" starts playing. Not to mention the conclusions themselves would be outlandish from an outside perspective, but thought from the inside make perfect sense... you're almost reminded of Sherlock Holmes at times.
Simon Blackquill is not only a complete Badass in nearly every sense of the word, but he manages to pull off character stunts in court where not only does the Judge not reprimand him for them, he even begins supporting them! The best example of this is threatening Phineas Filch to be punished by Simon's hawk if he should tell any more lies to the court.
Alternatively, psychologically manipulating The Phantom, allowing Athena to analyze his emotions.
Not only is Apollo's newlook incredibly Badass, but how did he get it? By throwing himself in front of a falling chunk of debris to save Juniper Woods. This was while the courtroom was exploding, by the way. Looks like he jumped on Phoenix's Iron Butt Monkey bandwagon in the most awesome way imaginable.
It gets better. Apollo said to Phoenix before the first trial that he basically wanted to take a page out of Franziska's book and stand in court despite his injuries.
When Athena goes Mama Bear on Gaspen Payne over his treatment of her childhood friend, Juniper (the defendant), and actually manages to get the Judge to side with her and tell Payne off. Given how difficult it is to get prosecutors in trouble for anything through most of the trials, that is awesome!
Phoenix Wright, at the threat of another courtroom bombing, not only doesn't run away, but also takes the time to prove that the bomb Tonate is holding to be a fake, and opens the bomb transport case to present the incriminating evidence to put Tonate behind bars!
The Judge also qualifies, refusing to leave and simply giving the reason that it wouldn't do for the one presiding over the case, cementing his position as a Badass Grandpa.
In the first day in court, Blackquill interrupts Apollo before Apollo can even really start his first sentence, something that hasn't really happened like that since you went up against Manfred von Karma (despite the prosecution ALWAYS cutting you off). Apollo, unlike Phoenix, basically tells Blackquill to button it and let him finish, which he then does. The delivery was awesome.
Also towards the end of the case: The Reveal that the Great Nine Tails is NOT Rex Kyubi, but rather Damien Tanma. Easily one of the best "turnabout" moments in the series. We also have L'Belle's Humiliation Conga during his Villainous Breakdown. After how much of a constant Jerkass he was, it feels incredibly satisfying.
At the end of the case, Robin Newman, Hugh O'Connor, and Juniper Woods all decide to work together to create a new future for the justice system, one where the ends never justify the means. Originally, their goals were all career-based, but they decide on a mutually-shared goal just as a big Take That (pun intended, given this series) to Aristotle Means' "ends justify the means" philosophy.
There's also Robin standing up to Means while he's in full Sadist Teacher mode, pulling a Big Damn Heroes moment to invalidate his alibi during the final trial. That takes some serious guts.
Robin Newman is easily one of the bravest of the game's witnesses. Adding to what was said above, she clearly isn't intimidated by Simon Blackquill, her insults knock him off his game so much that he's doubled over his desk in shock, and she's just about the only character who meets him and doesn't get attacked with a sword or by Taka.
Near the end of the case, Means starts throwing chalk at Athena to try and distract her from connecting him to the crime, causing Blackquill to sic Taka on someone who deserves it for once.
The Cosmic Turnabout:
In-universe, the "HAT-1 Miracle" when Solomon Starbuck managed to survive and return to Earth, despite his rocket nearly being destroyed by Phantom's sabotage. This gets even better when you later realize that Starbuck's successful mission helps in taking Phantom down as well.
Phoenix' reaction to Blackquill is not unlike Apollo's back in the second case. Blackquill tries to be his usual intimidating, condescending self, and makes a memory-loss-due-to-old-age joke on Phoenix. Phoenix's response? "Watch as you get crushed by my years of experience, little boy." This is the guy who saved Miles Edgeworth, crushed Manfred Von Karma, put away Chief of Police Gant, humbled Franziska Von Karma, and proved worthy of Godot. He's not intimidated by this young punk, convict or no.
Turnabout For Tomorrow:
A minor, spoiler free moment: Trucy stopping Yuri Cosmos's scooter by throwing a single stage knife. Phoenix notes that he should keep an eye on his daughter's magic tricks.
You break Athena's black psyche locks. You actually break black Psyche-Locks! Admittedly, she wasn't actually trying to hide anything so much as you had to hammer past her PTSD, but it's still massively impressive on your part.
This has, in turn, made Phoenix solving the DL-6 case and defeating Von Karma in the first case even more awesome than it already is; considering that DL-6 and UR-1 are very similar, and their respective defendants, who are just children, suffering similar traumatic experiences, this pretty much implies that Phoenix has already broken Black Psyche Locks, before he even got the Magatama, during the fourth case he has tackled in his career.
The build-up to that moment is just as awesome. The Phantomslowly begins to realise how screwed he is and starts a Hannibal Lecture about how emotions are pointless and humans can't really trust one another, but Wright and co. refute every point he tries to make. The Phantom finally loses his cool and breaks down, pleading to his employers to let him live. Wright, Justice and Cykes made a sociopath feel crippling fear and beg for his life on the stand.
Athena: You can't outrun yourself!
Apollo: Remove that mask and unleash your emotions!
Phoenix: Confront your guilt head-on...
All three: ...with your own, true face!
In Case 5, Athena pulls a Big Damn Heroes moment, allowing you to Mood Matrix Simon Blackquill's false confession. Even knowing she'll likely end up incriminating herself if she proves him innocent, she still won't give up on him, and finally manages to acomplish what she set out to do in becoming a lawyer, a day before his execution to boot.
After finding out Athena has a crippling phobia of courtrooms, suddenly everything they did in the previous trials becomes a lot more Badass in hindsight. Ditto for Simon's Batman Gambit to find the Phantom, that's apparently been going on all game.
The case has multiple bad endings. This is not awesome because of the events that occur during them, but rather because, for what may be the first time in the franchise, the game acknowledges that if you've actually proven someone innocent of the allegations against them, they aren't suddenly going to be found guilty simply because you failed to find the true culprit afterward. And if someone other than your client is accused of the crime and you can't disprove it, it is that person who ends up declared guilty.
During the fifth case, Phoenix manages to prove that Athena never killed her mother and in fact, that "Phantom" is probably the one who did it. When the judge is about to give a verdict...OBJECTION! But it's not Edgeworth or Blackquill — it's Apollo coming to accuse Athena of the murder of his friend Clay. Apollo then gives his logic during his testimony. It's the first time Phoenix and Apollo are on opposite sides, and it's awesome.
And it gets even more awesome once Apollo is convinced of Athena's innocence; they take the bench together to bring down the true killer, with Athena joining them a little while later. This is the first time in the series that Phoenix has not one but two sidekicks helping him in court at the same time, which leads to the triple-objection-fingerpointing moment mentioned above.
When Trucy is one of the people taken hostage in the Space Museum, she's put in front of a camera to convince Phoenix to cooperate. The first thing she does, when she's able to speak to him, is tell him as much information as she could find — how many hostages, how many robots keeping them captive, and so forth. She's pushed aside so she won't tell anymore, and shows no fear the entire time.
Towards the climactic showdown, when Athena is using the Mood Matrix on The Phantom, he jams her Mood Matrix with one of his tools. Simon, not fond of "Fulbright"'s dirty tactics, sics Taka on him and prevents him from using his jammer so Athena can continue analyzing him.
Much less plot relevent but still awesome was when the Phantom was terrorizing the defense attourneys with another device, when he tries to use it on Simon, he uses his "blade" to effortlessly deflect it back.
Athena has one that is very reminiscent of Edgeworth from the first game. Both of them share some parallels, but the most magnificent of them were that the actions they took as children ultimately brought about the downfall of their parents' killers. Edgeworth who threw Yogi's gun which caused Manfred to be shot in the shoulder, which was linked to the gun used to kill Gregory Edgeworth, and Athena who managed to stab Phantom's hand and make him bleed on the moon rock, causing him to leave evidence of his existence. It is arguably minor, but those two actions helped bring to justice two of the series' most vile villains.
For that matter, the fact that Athena stabbed the Phantom at all is plenty awesome. An eleven-year-old girl walks into a room, sees her mother lying on the floor with something clearly wrong with her, and there's a strange man wearing an incredibly creepy mask. He goes towards her, almost certainly to kill her, and she has the presence of mind to grab a knife from a toolbox and stab at him with it until he runs. In short, as a child, Athena drove away one of the most dangerous criminals of the Ace Attorney series.
The reveal that Bobby Fulbright is the Phantom. Yes, BOBBY. FULLBRIGHT.
The entire case is one for Phoenix Wright. After eight years of disbarment, his reputation tainted by the forging incident, he reclaims his attorney's badge. What's the first thing he manages to accomplish? Prove everyone involved in the case he handled innocent! In fact, he momentarily holds the Judge on his Not Guilty verdict just to prove that the witness on the stand is also not the killer, and that Shipley's death was accidental!