Title: Warning!
Review: I wish I had read these negative reviews prior to buying a used copy. A previously used Orange Box will not re-register. You WILL get an "invalid key" message. Wasted time and money on this purchase. Don't know why Amazon allows used versions of this product for sale. They shouldn't, as it has hurt their reputation for me. The seller claims he didn't know it would not play so I have to blame Amazon.
Is this product review negative?