Cowboy Bebop and both FMAs are a few of the exceptions to terrible dubs but even then if you watch the subs vs the dubs the actual meaning of some of the conversations get skewed in order to fit the cultural differences. It's hard to explain. I've also just gotten so accustomed to subtitles and natural voice actors I end up watching the subs regardless. Bebop and FMA I have re-watched in both. Also the old Slayers animes had decent dubs vs subs too.