I love the way fandom botherations go round and round. Because the "shiny new" aspect of Cam is exactly the way I felt about Jonas. There he was, all eager and bright and ... fucking irritating ... and we were told (by TPTB and the characters goddammit) that we would all love the super kewl, hunky, did I mention kewl? new character.
Hey, guess what? I didn't.
And in between season 6 and the introduction of Cam, they learned nothing.
I actually grew to like Cam a lot. I don't fangirl him as I do Daniel because Daniel owns my heart for all sorts of reasons, and I don't have issues about him replacing Jack (he'd checked out in any real sense for me seasons ago).
Cam doesn't impinge on Hammond's actions and achievements for me, either, but I see where you're coming from. Interesting stuff to ponder, thanks. :-)