With sales on the new Nova dropping issue to issue, it's really no wonder why as we see the reason right in comments from the new writer, Zebb Wells.
Wells is taking over writing chores for Nova as of issue 6, with Loeb and McGuinness bailing thought mostly due to low sales on the title (under 40K).
We see in the following comments that Loeb thinks Nova is an idiot and that Wells is continuing with that direction.
On taking over Marvel's "Nova" ongoing title from departing writer Jeph Loeb: I got the job because [editor] Steve Wacker caught me at a point where I had some time off. He had been sending me the "Nova" comics because he was just proud of them, and I had just fallen in love with them. So I'm kind of coming at it as a fan of what Jeph did. Jeph has been great, and we've had a few long conversations about the character. I was kind of going down one direction and I had a conversation with him, and he said he wanted to make sure that Nova remains an idiot. [>Laughter He wants it to be clear that Nova's a 14-year-old kid, he is not competent at what he's doing -- he makes foolish decisions. There was something about him saying that that kind of solidified my take on the character.