the first sci-fi that I reeeaaally liked Steins;Gate one of the decent shounen fantasy that I liked Fairy Tail
Ore no Imouto Amagami SS
Kaichou wa maid-sama Kimi ni Todoke
Ao no Exorcist Kuroshitsuji and all the angel-devil related
I sometimes base and rate the animes that I soon to like on the quality. like how the background looks so realistic but it's obviously from anime (excluding kaichou wa, I liked the story over quality) and the choice of seiyuuuus.