First off, the story stays very true to the game. There were a few side stories here and there, and relationships and events that happened in-game were fleshed out much more in the anime and actually were more exciting to watch. Characters that I felt like didn't have enough personality in the game (specifically Chie and Yukiko) were improved in the show, and became likable. Really, the anime did a good job of fixing whatever was wrong or felt incomplete with the game. (Keep in mind I'm only speaking of P4, not Golden, as I've yet to play it.)
There were moments that were really laugh-out-loud funny, too. Now, onto the unfortunate side of the show.
The animation is probably first on the list. There were moments where the animation was really good, and then moments where I wondered if the animators fell asleep. There are quite a few derp faces throughout and awkwardly drawn bodies (specifically hands and arms). I felt like Kanji really got the short end of the stick; I can only recall a few scenes where his face didn't look strange.
Next is the lack of explanation. In the game, the Velvet Room was decently explained, as well as Social Links, but there's no mention of social links in the anime, just what they refer to as 'bonds'. Which makes sense, but you're left scratching your head at what exactly these bonds are, and how they correspond to unlocking the new Arcana cards that Margaret mentions. Unless you've played the game, these scenes can be quite confusing. The anime does a good job of trying to actually flesh out these social links/bonds, but as a result, you're left with some pretty dull moments in episodes, or in the case of the "Do you love me?" episode, you're left with a whole episode of boring. It wasn't really necessary to give Ai Ebihara such a prominent role, but I commend the anime for trying. My final complaint would have to be the anime adaption of episode 26, which in my opinion is an episode that's totally optional to watch. In fact, I don't think you should watch it, period. 25 does a good job of wrapping up the show, but if you want to see what happens in 26, well...you've been warned. But be prepared to hit google up for an explanation, because I know I had to. It was just so poorly written and executed that even though I'd gotten what happened in episode 26 (trying my best to not spoil anything here) in the game, I still had to look up what the hell was going on.
All in all, this wasn't a perfect adaption of the video game, but it came pretty close. Aside from a lot of animation blunders that were rampant through some episodes, the story is very true to the game and even surpassed the game at some points in the level of enjoyment I got out of watching it. But if you haven't played the game, there are definitely some scenes you might be confused with. Still, that shouldn't prevent you from enjoying the show, because the story is still sharply written and the characters are just as lovable.
