I've never liked Ash's voice. Whoo-hoo, anarchy!
When I was younger, it tended to irritate me an awful lot, as I felt it sounded so...unatural when compared to the rest of the cast. Misty, Brock, Jessie, even James and Meowth sounded 'realistic', with that hint of cartoony charm thrown in, and each of those voices suited them. Then you had Ash, with this really scratchy, rasp of a voice. I always thought of it as being out of place and rather awkward. I mean, you had characters and filler guys like Gary and Richie who suffered from the same issues, but they were never around for more than an episode or two, so it was never much of a concern~
His new voice is considerably less of a raspy mess, but the fact that whoever does it can't seem to grasp the concept of acting doesn't make it much of an improvement. If any improvement at all.