To an extent, it is wrong. So far as illnesses and shit like that go, yes, get rid of them. I mean, I'm fucked so far as genetics go. My legs are gimped, I've got carpel tunnel (or however you spell it), and I come from a long line of fatasses, to which I'm probably the skinniest, not to mention the fact that I'll go damn near blind. If my parents could have gotten rid of all that, it would have been nice.
So far as altering physical appearance though, I kinda disagree with that. Too many people would look the same. Or we get the video game problem, what with teen parents, who'd just scroll to the soonest thing they like and click that.
That being said, if gene-testing brings the power of flight forward, I will not complain at all. You could make everyone look and sound like Gilbert Godfried and I'd still be okay with it.