Story (9):
Let's start right from the beginning of the season which continues after the summer vacation section of the school year. By now you have learned how much potential each of the students has, what their roles are in the classroom and what their specialty of assassination style is. So why do we want to be invested in the story in season 2? Well, for two reasons: one, we want to find out Koro-sensei's backstory; two, we want to see what shenanigans happen to the students. As I said, there will be no spoilers here, but the story gets itself turned on its head with some of the plot twists, which for the most part all well placed. If you don't like sci-fi, you probably won't enjoy a lot of Korosensei's backstory. You will see plenty of new developments with the antagonists we've met in this part of the anime, but also one new one. The story is heart-wrenching at points, but if you like having your heart-strings pulled you will enjoy the ending, even if it was fairly predictable at points.
Art (9):
So, why not give Assassination Classroom a perfect score for art? Well, it's a nice and clean art style that drastically shifts depending on the tone of the plot, but for the most part, if you've seen lots of shounen anime before, the fight scenes don't stand out that much; not even the climactic, final battle.
The stylistic black outline gives it a manga feel that really makes the characters pop. The lighting and shadows are pretty standard, but there's nothing that really stands out. It's amazing, despite its deliberate inconsistency at points, but it cannot be called perfect.
Sound (7):
The soundtrack is quite memorable in season 2. The opening songs: "Question" and "Bai Bai Yesterday" really match the steadily changing tone of the plot which is always a plus. The background music for the anime itself is always fitting, as are the sound effects for the action sequences. So where does the anime lose most of its points? The English. Whether deliberately cringe-worthy or not, the Japanese voice actors (specifically Karma) speaking English while understandable is as bad as (if not arguably worse than,) in season 1. Actual English speakers speaking English during a school competition is also cringe-worthy. It does add to the humor in the show so it may be deliberate, but it's still painful to endure.
Character (10):
The strongest part about this anime is the investment you have in Koro-sensei and his class, and the character development that we see in this season is very nice. The coming of age element in this school anime is spot-on and paced well for Nagisa in particular, who is our main focus, but we also see how far the students have come as a now-harmonious class despite adversity and their differences. The tension between characters and the mediation of Koro-sensei and Karasuma-san make this season even better than last season, since we see the students finally use their assassination skills obtained over the school year in their final mission. Plus, we see some very drastic changes in some of the antagonists, who would otherwise have been quite flat.
Enjoyment (10):
First and foremost, this was a comedy-action anime, and Assassination Classroom delivered in spades. There is PLENTY of action in season 2, from parkour, to combat, to travels taken throughout the plot. The dialogue is extremely well-written for each of the characters which made me quite invested in most of them and my friend and I had quite a few laughs watching it together. Koro-sensei does more than teach his class, he teaches everyone around him and also the viewer to always take different perspectives and not to get lost in our anger or anxiety. He's more than just an anime character, he's a real teacher.
Overall (10):
I believe both seasons of this anime are special, and should be visited by everyone who wants something completely obscure to watch or likes weird anime. Season 2 does what season 1 does with a more serious tone at points (similar to the end of season 1) but is only more enjoyable for it. You will only enjoy the anime more by watching season 2.
