I'm more upset about the fact that we've seen Ralph and Sue as ghosts already, and even that I'm willing to hold off on judging because it's only been one issue. We have no idea about the mechanisms behind the Black Lanterns yet, really.
Other than that, like people have said, rebirth has become the whole point of Hawkman and Hawkgirl. In that respect, having them be the big death at the end of issue one is a lot more powerful than just some meaningless death (coughUltimatumcough) and is pretty compelling.