Maybe you shouldn't have focused on the actual score the game received and instead read some of content of the reviews, which I will guess would have definitely mentioned that the story totally hinges on your having played the previous games in the franchise, and how many loose ends that game ties up. Metal Gear Solid is massively story driven, not sure why you would expect to be able to jump into the finale of the whole thing and expect to follow what's happening.
I've never seen Lost the TV show. If I bought the last season and started there then I would probably have a pretty shit experience with that too.
@jdh5153: From experience having a larger hard drive is always better. In regards to whether a game plays better after it's installed, my experience has been quite varied. I have two ps3's and one of those is an old 80gb finger print magnet model which still works fine. But for warranty's sake personally I would get one new, I don't know how hard it would be to get a refund on craigslist. Also The Last of Us was pretty great.
Steam will keep you updated on the latest version. It will automatically download the most current patch, so if it isn't downloading anything you're likely right where everyone else is. I purchased Arma 3 way back in alpha and mine still says beta as well, so don't worry. Also, I'm downloading some 3.5 GB patch right now which I'm guessing is the patch to make it the full release. Don't worry too much duder.
Ah ok yeah now that I come to think about it that's probably it. Thanks for replying, you have put my mind at ease, if not my itchy trigger finger.