I pre-ordered last minute, and got the caravan stuff. (sturdy shotgun ftw)
I had MAJOR issues at first. E/g i would kill a bunch of stuff, then like 5 minutes later I'd hear all the gunshots and what not. That on top of stuttering, lag, and overall s**ty gameplay issues.... The second patch did little to correct any of that, for me anyway (see specs lol). But! I recently installed 7 (again, thanks to my sibbs backup disc yay.) and I gotta say, The game is 100x better. The sound Works, the controls work properly, and the game floats at a decent frame rate. Overall better.
Now that I can actually play the game, Im hooked, line, and sinkered. about 9 hours in, and lovin it. The story so far is'nt as deep as Fo3, but still pretty good. The weapon mods are neat, and the craft system is pretty tight, a lot of new stuff to tinker with. Hopefully the other little issues get ironed out sooner or later. My friend found a little infinite experience loop, and got to level 20 in like 4 minutes (lol)
tl;dr - awesome sauce. happy gaming turkeys