Why isn't it called Attack OF the Titans, /a/?
Attack on Titan implies that there is only one Titan or that Titan is the name of a place that's being attacked.
Because its a shitty anime for otakus with superiority complex.
Because they're fighting back, beginning the Attack(s) ON Titan(s).
>(進撃の巨人 Shingeki no Kyojin?, lit. "Advancing Giants"
Because Japanese people don't know English, and apparently neither do anime fans because they think that the 11's bad English is correct