Yoko's eye candy, but it's not like one has to go crazy over her...wouldn't really be a good idea, anyways. She has a gun.
Sometimes the focus on fanservice is a bit excessive, though that alone doesn't bother me that much when the show's fun enough.
As for Kamina...he's manly but surprisingly, my first impression of him, even in the Japanese version, wasn't quite as overwhelmingly positive as the ones I'm seeing around here. You can see he's got guts and can use them, which I liked, but there's also an annoying side to him which I can never quite appreciate, even during the first two episodes.
The dub got that last part right too, in any case.