Attack on Titan's second OP (Jiyuu no Tsubasa) is better than the first (Guren no Yumiya). The detail is far far greater than the first which is mostly just an actionfest, also the song is better though that is subjective.
Sasageyo is a close 2nd and if I were to rank them it'd be 2>3>1>5>4
I don't like FMA
I like FMA:B
Popular anime is popular because it's good
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MHA is a good shonen, with some flaws in writing part.
My favorite Code Geass OP is Kaidoku Funo
Jiyuu no Tsubasa references Guren no Yumiya so this is a strange take.
I think it fits the second season a lot better, though. Guren no Yumiya is a great single but it's a poor fit for the first 10 episodes where humans get buttfucked over and over.
Majority of people like Brotherhood though.
I don't know. we're on Yas Forums and it's a contrarian thread