Tonari No Seki-Kun may be the funniest anime I've watched since starting Gintama. That is saying a lot, since the episodes are quite short at about 7 minutes long, but that is plenty of time for this anime to tell an effective and hilarious story.
Story: 9.5/10
Short, sweet and to the point. Seki-kun's antics and Yokoi's great imagination and creativity are so entertaining to watch. They use the best methods of storytelling with Yokoi's expressive narration in combination with Seki-kun's almost exclusive use of physical comedy to tell creative tales of love, hardship and determination using common toys and games. They are such simple stories, but I haven't laughed so much watching an anime in so long. You cannot help it when you see how ridiculous Seki-kun and Yokoi can get. The only thing keeping this anime from getting a 10/10 was that they occasionally repeated "toys/games", but the seeing these toys/games again may have been funnier than the first time around.
Art: 10/10
Sound: 8/10
Not much to say about the art...it's awesome. Love the use of colour scheme in the different stories. They used sound clips pretty well to add from the scene but I find that I didn't pay attention much to the sounds as I was so caught up in Yokoi's storytelling. But a majority of this score goes to the opening and ending themes; catchy and unique.
Character: 9/10
Yokoi's imagination makes the show what it is, as Seki-kun barely (if not ever) speaks in the series. Her interpretation of his behaviour is hysterical. Despite not speaking, Seki-kun's physical comedy is second-to-none. He comes up with such imaginative ways to play and mess around during class. I won't reveal these next "characters" but these 3 little guys stole any episode they were in. Seki-kun's interaction with these 3 "characters" really made them my favourite secondary characters despite never speaking either.
Enjoyment: 10/10
Overall: 10/10
I think it is obvious how much fun I had watching this series. It is an easy series to get through and so is definitely worth watching. I really hope there is another season or 2 because I just can't get enough of this classroom fun.