I'm at Chapter 3. The game's run perfectly for me. But there's some rumors that there are some (obviously) bad copies floating around, which is common with a few games. The PS3 version is particularly with its share of issues. Stemming from freezes to corrupt game saves to the rare bricking (depending on how well your system's been running for you and how old it is), these are only affecting a small percentage.
Now, this may seem like a scare compared to the blog I posted before about there being some bad Heavy Rain copies floating around since this game was another highly anticipated game and part of a long standing series...but its more of a precaution.
Aside from the common issues up above, the big thing going on is that the game has data streaming. Which means it is constantly sending data through the Blu-ray drive into the unit, thereby eliminating load screens (some games have done this, like Uncharted 2, Bioshock 2, and no doubt the up and coming God of War III) and allowing you to play games without seeing the dreading 'Loading' screen beyond the game's initial start up (except during cutscenes and whatnot).
How is this a problem? It has the Blu-ray drive operating constantly to read the disc. And sometimes, like any DVD drive that gets used too much, it can wear out and die.
I've played a lot of games lately that worked to kill off the loading screen. I played Bioshock 2, Uncharted 2: Among Thieves, Heavy Rain, and Final Fantasy XIII. These are a few games I know of that keep the Blu-ray disc running constantly in order to deliver a great gaming experience to you all.
Right now, the only game that's given my PS3 any issues in the history that I've owned it was Fallout 3 (because of its massive bug collection and the fact it's so diverse compared to Oblivion).
So I, like all the rest of you, am hoping that my system doesn't die. It's stuck by me for nearly 2 years. And I intend to make sure that it can keep running as long as I possibly can.
Anyway, this'll be a blog you can spread around to your friends. Have them post if their copies are good or bad, what point in the game they are at, and (if they have bad copies) what happened to their machines.
I am safe to say that I haven't encountered any issues yet. But I'm nowhere near getting started with the game. See ya guys soon!