I reported some problems with rental discs earlier. Everything I've watched has been a Blockbuster online or store rental.
Out of the first few discs I watched, 3 had one bad spot (2 where the player didn't automatically recover). One bad spot was near the end of the film, one was very early on and I don't remember the other.
Since then, I've been cleaning every rental disc before watching. After the 3 discs with glitches, I'm happy to report I've watched 9 more titles without any playback problems. I do in-store exchanges and none of the discs I've gotten in-store have had a problem, only some of the discs that have come through the mail.
So personally, I've accepted the occasional glitch as fact of Blu-ray rental by mail. I don't think the discs are really up to it. I'm very happy with my player overall and I don't think these glitches are a player issue.