I bought this game on Steam and played it in Windows 7 in Bootcamp on a MacBook Pro.
There were a lot of crashing with the game initially; apparently the default install is a horrible experience full of crashes and blue screens for many, many players. It took a lot of searching and a lot of fiddling around to get the game to play for more than 10 minutes without crashing but eventually I found the right combination of settings and the game played great.
When the developers say that this is an open world game, they are not kidding. You can go almost anywhere at any time and while wondering around can be solid fun, later in the game I found it annoying. I would stumble upon things that were obviously a part of some quest but I had not found the guy that would give me the quest yet.
For example I found a violin in one of the Vaults (a place where people lived to get away from the radiation), it was definitely part of a quest as I had found nothing else like it in my travels, but I had no idea what to do with it or who could possible give me such a quest. With the help of the Fallout Wiki I found out where to get the appropriate quest and the game did a great job of giving me a good option to complete the quest easily once I found the right person.
That is one of the most impressive parts of this game, how it compensates for the user not following the main quest arc. I did all kinds of things trying to see how I could break the game and felt that I never did.
I really enjoyed this game and look forward to playing the next in the series, Fallout: New Vegas.
From the official web site:
Vault-Tec engineers have worked around the clock on an interactive reproduction of Wasteland life for you to enjoy from the comfort of your own vault. Included is an expansive world, unique combat, shockingly realistic visuals, tons of player choice, and an incredible cast of dynamic characters. Every minute is a fight for survival against the terrors of the outside world – radiation, Super Mutants, and hostile mutated creatures. From Vault-Tec, America’s First Choice in Post Nuclear Simulation.
I rate this game an 8 out of 10