Anime is entertainment coming from a mostly non-Christian Country: it's not a sin to like anime, but many anime series out there can lead to sin.
I'd say it's better to just take the few good ones and avoid like the plague the bad or dubious-in-nature ones.
I'd say it's like junk food: once in a while, whilst not being healthy, will not kill you; consuming too much of it, however, will certainly damage you.