Eh. My problem with CNN is less sensationalism and more... focus, I guess? More times than I've cared to count I've checked CNN and the main news story they're promoting is something asinine like "WHAT THE AMERICAN IDOL JUDGES ARE REALLY SAYING" instead of something important. They HAVE stories on those issues most of the time, but it's only sometimes their headliner.
I will admit that that they're all fairly similar, though. Makes sense with Al Jazeera and the BBC, at least, since many of the initial staffers of Al Jazeera English were staff of a defunct BBC outlet. And when CNN reports on things people should give a shit about it is of a similar caliber.
Although CNN TV is nigh unwatchable nowadays. Their reporting of Michael Jackson's death really turned me off to them. After that happened the only "serious" programs seemed to be the hour of headlines and Fareed Zakaria's show. It may have cooled down again but eh. I don't have cable anymore.
EDIT: And even then it was still better than the Daily fucking Mail.