@justyourhero: Yeah, that's what I experience, too. I can get in with the PSN app, see a few things, then when I go to look at something else I dumps me out to start all over again.
I was able to briefly see the Career section from my PC this morning. I attempted to edit one of my Custom Classes and save the change to it. When I did so, it kicked me out and now when I go back into it I get the message saying I have to play a MP game in MW3 to create my profile.
A complete waste of time right now, but since I have only been able to play for 4 hours since I got it Tuesday, there's not much to see for me at the moment anyway. Rank 20.