My top 10 changes a lot, so I don't bother ranking them, but below is a list of anime I've given a 10/10. Highly recommend them all. There's more than 10..gomen gomen.
Toradora!
Code Geass
Tengen Toppa Gurren Lagann
Fullmetal Alchemist Brotherhood
Usagi Drop
Mawaru Penguindrum
Ore no Imouto ga Konnani Kawaii Wake ga Nai
One Punch Man
Made in Abyss
March Comes in like a Lion
Psycho-Pass (only season 1)
Assassination Classroom (only season 2)
Sakamoto Desu Ga?
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