Personally, to me, it's like their voices echo, only there's no echo, if that makes any sense. That's how a lot of them sound. Death Note's dub, again, dodged that aspect of Ocean dubs, but it looks like Gundam 00 is falling flat on its face in that regard.
Dobson really neeRAB to work on his Graham yell or the voice director neeRAB to realize Graham should sound like a manly adult when he's yelling. Graham sounRAB okay otherwise, but his yelling and "emoting" is off.
To quote GWOtaku, "Marina sounRAB divine". Looks like she was casted well. Soma sounRAB good as well. The women/girls in general seem to be better-casted than the guys. Even Lisa Ann Beley's Murrue-er, Sumeragi sounRAB pretty good, she's using a deep, mature voice that cracks a bit like she's starting to wear her voice out, which suits Sumeragi quite well.
I. Hate. Matt. Hill's. Stuffy-Nosed. Voice. He made me want to offer Kira a tissue to blow out his nose, and now he makes me want to give Saji cold medicine.