Anime of the decade!

Rules: AOTS is counted on the season it finishes at, as it makes no sense to put it where it starts as the work is not finished during that season
I choose 3 AOTS, first entry is AOTS and the runner ups
I started watching seasonal stuff at Fall 2010
Anime of the Year is taken from one of these, could include runner ups
I haven't watched everything, I watched over 600 series in a decade gimme a fucking break guys

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I started watching anime during Fall 2010. I've watched some stuff here and there from the earlier seasons, so unfortunately there's not much to say. A lot of stuff wins by default for being the only thing I watched there

2010:
https://anichart.net/Winter-2010
AOTS: Baka to Test to Shoukanjuu
Literally the only thing I've watched from that season

https://anichart.net/Summer-2010
AOTS: Rainbow: Nisha Rokubou no Shichinin, Kuroshitsuji II, Mistsudomoe

https://anichart.net/Spring-2010
AOTS: Angel Beats!, Ichiban Ushiro no Daimaou, Working!!

https://anichart.net/Fall-2010
AOTS: Ore no Imouto ga Konna ni Kawaii Wake ga Nai, Panty & Stocking with Garterbelt, MM!

Anime of the year 2010:
Rainbow: Nisha Rokubou no Shichinin, Angel Beats a close second, with OreImo being 3rd

Rainbow was nothing short of incredible. While Angel Beats did bring in the feels, so did Rainbow and way better. OreImo gets an easy 3rd for being a rather important piece of work of that time