My score of 9.8/10 does not represent an objective rating, but rather my enjoyment of the series.
Before we get to the overwhelming positives, let me get the ONE negative out of the way:

FUCK. KIMURA. i hate this man's guts. Every time he appears on screen i just get sad that he is tarnishing an otherwise perfect show. He is not funny in the slightest, has no redeeming qualities and has no character development whatsoever. He is just creepy and gross and unpleasant. He deserves to burn in Hell. i don't get why an otherwise incredibly wholesome show had to include this "character". In general, i don't get why so many anime need this "pervert" character that is either pedophilic, incestual or both. It's just not funny and takes me out of it so much. Thank god he wasn't there too much. Without him, i think my enjoyment rating wouldve been a 10.

Now that that's out of my system, let me mention some small things i wish i had seen:

• i wish Tomo had a moment where she apologized or at least felt remorse for being annoying. i don't dislike her, but she definitely does get on your nerves a little bit. i understand that it's her whole character, but just a small moment at the end would've been perfect.
• i wish i could've seen more of Kaorin, her love for Sakaki was actually pretty funny and quite cute. It would've been cool if it got developed a little more.

Everything else about this show is perfect in my eyes.

The humor is definitely not for everyone, but i knew from the moment i saw the "OH MY GAH" clip on YouTube that it was exactly my thing. That clip alone actually made me watch the series and i'm happy to say that it was an excellent decision.
The jokes are unpredictable, goofy and have perfect comedic timing. i genuinely would constantly burst out laughing. Sure, the jokes aren't very complex or anything, but they would always get me anyway. And the delivery is always on point.
The voice acting is amazing. It's quite exaggerated, and the actors aren't afraid to really go all out. Every voice is perfectly cast in my opinion.
The animation is very simplistic and quite choppy, which not everyone will enjoy. However, i found it extremely charming and i grew to really love it. It fits the silliness perfectly and makes the physical comedy and wacky faces the characters make all the more hilarious.
i LOVE the main characters. i got so attached to them, and their shenanigans are so fun to watch. i could honestly watch them do anything and i'd love it.
The main cast from least favorite to favorite:

• Kagura : my least favorite of the main 6, i think she's a nice person and her drive is commendable. Her constant desire to compete with Sakaki wasn't bad, but out of the running gags i didn't find it particularly funny. i like how she has good chemistry with Tomo. Definitely don't get me wrong, i do like her.
• Yomi : Feels like the most normal character, but that does make her a little forgettable. She does feel like an emotional anchor, that keeps the other characters from going too far which i like. i also really like her role as a foil to Tomo's antics. Her diet shtick is fun too.
• Tomo : the firecracker. She can be very funny with how much energy she has. Although, as i said before, she can be a little annoying because she's kinda mean lol. Her bullying of Chiyo is pretty damn funny but like, she never apologizes.
• Sakaki : an amazing character who is very sweet and smart. Her love of animals is adorable and i loved seeing her progress throughout the show in terms of that. i do wish there was a little more to her though.
• Chiyo : Gosh this girl is adorable. She's such a good friend too, and really funny. i'd say she's the emotional heart of the show, and the voice actress is incredible. i think it's impossible to not like her.
• Osaka : My favorite anime character of all time. This girl is the funniest, most precious and lovable character ever put to screen. Everything she says is so out of pocket and hilarious. i genuinely can't get enough of her. She's iconic and deserves the world. At heart, she's actually super kind and cares for all her friends. i really have to give props to her voice actress for NAILING every single line. i absolutely love how she so gets serious and then says the dumbest shit imaginable. And even the way she moves and just stares blankly is so funny.

i also have to mention Yukari and Nyamo. i love their dynamic so much, and Yukari is insane. The whole Yukari-mobile gag is one of my favorites. Great characters.

There is no real overarching story obviously, except for the fact that the characters progress through all three years of high school over time. The ending of the show is perfect though and got me pretty emotional.

IN CONCLUSION
A genuinely hilarious show full of cute moments and lovable characters, including my favorite character ever. Basically a constant smile machine, except when Kimura is on screen. Excellent voice acting and charming animation. It is very simple and childish, and honestly kinda retarded. If that sounds like your thing, then DEFINITELY watch it. However, if that doesn't sound like it's for you, you probably won't like it. i think this is a show that will only be loved by a certain type of people, but most people would find dumb. If you're unsure, give the first episode a watch, and by the end of it you'll have made up your mind, guaranteed. As for me, i LOVED it. i'm so sad it's over.