Episode 1 - In a similar vein to GAA-1, this case does a nice job of building Susato's character and clearing up part of the ending of 1-5. Whilst a simpler mystery to 1-1, it is also much better paced. A decent tutorial, in other words; but the lack of the Pursue mechanic always stood out to me.
Episode 2 - I wasn't quite expecting a flashback, and I'm not sure whether the set-up for the case is contrived or not, but this case straight away goes to show that GAA2 fixes the biggest issue with GAA; the pacing (by virtue of returning to the standard AA case structure). Despite being a filler case until the very end with the Professor's dog collar, it was still an fairly intriguing mystery. Soseki is also a good character, so in all, this was a good case.
Episode 3 - Now, the game really gets doing. Putting aside revelations surrounding Kazuma for a second, this case has a great mystery tied into a great backstory (the Professor "coming back to life", an incident which is itself worthy of a case; which, technically, is true). The character development for Van Zieks is especially noteworthy, alongside the second Dance of Deduction segment in Drebber's house. Special mention goes to Sholmes acting as a waxwork as well. I also like that Gina grows and becomes an apprenctice of Gregson. The twist at the end that Drebber did not kill the victim was also not expected; the way he acts (by blowing up the contraption) makes you think he did (and I'd wager he thought he had as well). When combined with final twist that the Professor was Kazuma's father Genshin (or, at this point, belived to be, seeing as we know it was really Klint Van Zieks), and the return of Susato, it's a very good case. Once again, the pacing was also very good.
Episode 4 - Straight away, you can tell stuff is beginning to kick off when Van Zieks is arrested. This case parallels The Cosmic Turnabout from DD in many ways; it introduces a bigger incident which is resolved in the next episode. Otherwise, fighting againt Kazuma (with his excellent "A Prosecutor, Reborn" theme) was a highlight (which continues into GAA2-5) and does a lot to build his character. Like many fourth cases, this one is a bit of comedic relief, with the Red-Headed League; but even still, it does a great job of hinting that Gregson was up to no good as part of the Reaper. It's hard to judge this one on its' own, when like DD-4, it is just part of one case split into two. Still, it was really enjoyable. I do find it surprising that the Jury are ditched for the rest of the game; it means that they're used even less than GAA.
Final Chapter - In all, this was a great ending. It was well-paced, and did a great job at tying up all the loose ends across both games (the Profesor, the Reaper, the list of names, Kazuma's 'death', how Susato knew the manuscript name, Iris's father, what Brett was up to in GAA-1, et al). Stronghart is perhaps an obvious villain - I had an inkling even back in GAA-3 - but he plays the role well; in particular, I like the fact that he takes over as the judge (which is a first). Small touches such as him controlling the balls of fire used in the Scales of Justice and his oddly... unicorn-shaped gavel, when combined with the variation in common music themes, make the case just feel climactic. A particularly standout moment is the Dance of Deduction with Mikotoba and Sholmes as they rush to find Jigoku; the use of "Partners - The Game is Afoot!" makes the moment stick out all the more. The way Sholmes saves the day twice was also really good. It's also an oddly emotional ending; which continues to show that the characters in both games are a big highlight - I was silently hopeful that Susato would return to Japan, so I was happy when that happened.