The frozen controller think I have experienced, but not with U2. I just booted the PS3 up and the controller is unable to sync with the PS3. Maybe FW 3.0, that added this issue, since I can not remember seeing it before that FW was released.
If I turn on the controller, then turn the PS3 on at the wall, the controller will turn the PS3 on but it won't sync. At all. I have to switch it off and wait for the controller to also turn off.
It's very, very irritating. And completely reproducible.
As for the game, I haven't played it much but I have encountered quite a few bugs already. The oddest was after taking down an enemy, the physics went mad. The body flew into the air, and landed right in front of another enemy.
Having enemies see you through walls during stealth, getting stuck in the scenery, etc, has already happened quite a lot. :-/
I need to play the game more, but so far I'm finding it's a very pretty face on shallow gameplay. Disappointing. Hopefully it'll pick up, because the non-combat/stealth sections are excellent.
And waiting to auto-save before you reload is just infuriating. Sure it's only a few seconds, but for some reason it just annoyed me enormously. If I want to reload that means I messed up, I don't want to save when I've messed up!