Greg Ayres is playing Sunohara.
Overall I watched the first episode of the Clannad dub and it isn't as bad as I thought, but I won't say its one of the greatest dubs I've ever seen.
I can't quite agree with this comment:
Let's just say that American voice actresses just can't do the whole Japanese high school girl thing. They always sound like they're 35 or something.
Here in America, at least, by the time you're in high school, your voice is already matured to where it's going to be in 30 years. Fact that Japanese portray high school character voices as younger than they actually are, I would say isn't quite right. Then again I don't know if their voices mature as fast as everyone else's. It's like facial hair and how Japanese don't usually have extreme amounts of facial hair (amongst men) unlike in other places of the world (not sure how much of that is true however).
I think these voices work okay. My problem is how they pronounce "Nagisa". I cringe everytime it's said in the dub, however I can deal with that. As far as dub hating, I dislike the war between dub and sub. Problem is dub haters try so hard to convince others not to watch dub. Why try to convince others to follow your personal preference? Let them decide for themselves if the dub is good or not. I'm neither a dub or sub fan (I'm both fans), I just find whatever comes to me first. Sometimes it works, sometimes it doesn't. You just gotta let people figure out for themselves if dub is the way they want to go or not.