I bought it on 360 a few days back, I'm really enjoying it. Although I was a bit bummed that I couldn't get a ps3 version (bought from a local shop that wasn't getting any more copies in) as I already have rearmed on ps3, and I don't know if the linkability is worth another $10..
I agree on the radiation too, its really bad when there's collectibles right on the edge so you die attempting to collect them