Hmm... although of course, I really preferred the original Japanese voice acting, I also found that the english dubbers for Fullmetal Alchemist weren't all that bad... XD
Here's some animated images that I've made...
[Only registered and activated users can see links. ] Lio vs Shiki
[Only registered and activated users can see links. ]
Mari Makina Canaan and Alphard
Sakura
[Only registered and activated users can see links. ] Kotaro vs Negi
Full Metal Panic had one of the few dubs that I actually enjoyed, if not preferred, over the subs. I just didn't like the original Sousuke's voice. Go figure.
I don't know but from what I been told, but Sailor Moon is pretty well down. Or at least the main female [Serena in English] had really high pitched voice on Jap version. While on English it was much better.