The weakest of the trilogy. The cases are not as consistent as the other two games, but the addition of Pearl and the new soundtrack are welcome changes.
The main thing I play the Ace Attorney [逆転裁判]
games for is the ability to solve the mysteries of the cases, and I liked the twists that arose in cases two and three, but the other two I did not enjoy. The fourth case has a fantastic premise, but I didn't like the twists introduced in the trial parts. I would describe the fourth case as being "unnecessarily convoluted". The first case irritated me as it had too much dialogue.
As for the rest of the game, the soundtrack in this game is by far my favorite of the trilogy. I like the cross-examination theme and the pursuit theme here better than their previous versions.
Oh, and the addition of Pearl to the Phoenix/Maya duo is a welcome sight. Mays's constant chattering annoyed me a little in the first game, but Pearl is a different beast entirely. Pearl is one of those unintentionally amusing characters. She is a child, but a remarkably aware and inquisitive child. She is also of a culture completely of her own, and her unintentionally hilarious questioning of mundane things adds a huge amount of depth to the group's chatter.
Consider this exchange between the three of them about how Pearl managed to arrive at the courthouse from Kurain Village, unaccompanied:
Maya: Wait, Pearl, did you walk all the way here from Kurain village by yourself?
Pearl: Of course not, I ran!
Wright: (Oh my. If it took two hours to get there by train, then...Oh my.)
Maya: But Pearly, what about the train?
Pearl: What's a "tray-ain"?
That hilarious sequence would not be possible without Pearl.
Overall, hard to rank this game in the trilogy, but probably the least good of the three.