Generally large eyes indicate innocence. The narrower the eyes, the less innocent. The notable example is in anime like Spiral where this girl:



Is in fact a bomb's expert with no qualms about killing people who get in her way. And is about 16.

Anyways, anime shouldn't be judged as a whole either negatively or positively any more than movies or television shows should be. Some is good, some is bad. It just depends on what you want to see.