Jesus it's the buggiest game I've ever seen. All the freezes, crashes, and inventory-destroying issues will have you ripping your hair out and tossing your console (or PC, if you're "doin' it right"). And besides the bugs, the quest structure is so ass-backwards, you'll write to Obsidian telling them your mind is full of fuck.
Now, all that said, when the game does work, it works brilliantly! It's as fun as any other Fallout game and twice as expansive. The way they squeezed so many missions into one area while also keeping it fun and new is pretty cool. I think you should just buy it, but be ready to return it if you have a short-fuse.