I don't agree. I watched the show subbed, but went back and watched a few episodes dubbed just to compare (since I have the DVDs anyway, might as well), and ugh, I could not possibly watch this show dubbed. Nagisa's dub voice just grates on me so heavily.
Seriously, I think dub companies need to start hiring teenagers to voice teenagers, instead of making thirtysomethings speak in a horrible fakey falsetto.
Tomoya's voice is pretty awful, too. It's too deep and scratchy. He sounds like a heavy smoker.