My biggest pet peeve with using my PS3 as my BD player is that it never resumes playback from the point where I stopped watching. For example, if I pause a movie during playback, and then shut off the PS3, when I power back up, the PS3 brings me back to the BD's main menu instead of resuming playback from the paused point. I then have to try & remember where I left off.
Is there a setting that I'm missing?