User blog comment:Mini-Sleuth/Armin/@comment-12642484-20131214092246

It is probably because manga in general is more dialogue oriented than anime, which is more graphic oriented. You must keep in mind that manga readers finish a chapter full of action scenes much faster, than a chapter full of dialogue. An anime however is not restricted like that, as it can vary the use of dialogue and action scenes without any consequences on an episodes lenght. This fact can be used in a good way in animes to avoid filler content in manga adaptions by adding/extending action scenes. These action scenes put the strong fighters into the stagelight "elevating" them from more dialogue-oriented characters like Armin. Because he never had his own epic fights, his performance is simply overshadowed by the likes of Eren, Mikasa, Levi, Annie, etc.

This is probably why he seems more like a "crybaby".

Or maybe the anime team simply messed up Armin as a character, which is much more likely. Or maybe it is his voice?