I really enjoy a good anime serie or movie. You cannot put the whole genre as "childish", really. I mean -- Miyazaki pretty much convinced the rest of the world that even if kids are at the center of his works, it is far beyond childish, it has tons of layers and of amazing creativity bursting about.
(In the same way, pretending that "cartoons are for kids" -- Calvin & Hobbes was never just for kids, and always very deep in its questioning of life. Shows like The Simpsons, Family Guy, Futurama and South Park -- definitely NOT for lil'kids. )
The thing is, with anime or cartoons, you can achieve some very interesting visual effects and work on amazing storylines that don't need to be grounded in the limits of the special effect capacities or of the ethical allowances.
I enjoy good anime. It can be quite great.
I also enjoy the japanese voicing, it's nice to get a feeling for flow and pronunciation and commonly used Japanese vocab.