The english voice actors for Inuyasha don't even pronounce their character's names correctly, and you don't need much training for that. Japan takes voice acting far more seriously than America does.
Even if you cut the regular bust size jokes in Slayers, the really big reason it isn't on mainstream television is the phrase "In thy great name I swear myself to darkness". Lina says that every time she casts the Dragon Slave, which means she sells her soul to the devil (Literally - they flat out state that the spell involves swearing fealty to Shaburanigdo in the series) every two to three episodes. This is so far off being politically correct that it will never be on any station a kid could see it on. And since that detail, and the corresponding phrase from the Giga Slave are important plot details, they can't be edited out.
Then again, one episode of Tenchi Muyo centered entirely around towels falling off the girls at a hot spring, and Cartoon Network showed it anyway (after painting swimsuits onto the girls).
There is no excuse for showing DBZ on television. It is the single most popular BAD anime in the world. It takes forever for anything to happen, the plot concepts are just plain absurd, and whoever cast the voice actors should be shot. The thing that really gets me about it, however, is that everytime a GOOD anime on CN is about to reach a long stretch of episodes I haven't seen yet, the show is cancelled and replaced with DBZ (This has happened several times).








