When you're offline, none of the categories on the XMB display their content, no trophies, no profile, no store, no friends, no messages, no game icons, it's scary how in-your-face useless the console becomes in this state without the internet, at least the ps3 didn't look so empty on OS level, you could still look at your trophies, messages and listen to music and watch videos stored on the hdd.
There just making there own problems with this, increased server usage and costs, annoyed customers when things dont work and they seem to not work quite often. There's no benefits to Sony or the customers with the way they have things constantly having to be called from the server. I even get games which have barely any online functionality, Wolfenstein, interrupting things in the middle of a cutscene to tell me that the network functionality has gone. It does feel like an always online console.