best sci-fi anime:

Mobile suit Gundam 00 (2007)

sci-fi, drama, politics, mecha

Macross Zero (2002)

sci-fi, drama, romance, mecha, mystical

Toward the Terra (2007)

sci-fi, drama, mystical, space colonization

Macross Frontier (2008)

sci-fi, drama, romance, space colonization, mecha

Blue Gender (1999)

sci-fi, drama, postapokalyptic, horror