The whiny child bit does seem to be prevalent in many of the Primarchs.
Hah!
Loved the Wolves ever since. They have loads of character, and I love that they're always willing to hike a leg up and whiz on the Codex.
I've always like Russ b/c he really didn't seem to have Super Powers either.
And it's been fairly obvious that he isn't all 'viking', but uses that as a cover to help people underestimate him.