The only reason I would preferring a disk over the download copy is that I'm not the only person in this house who plays computer games and my brother tends to get annoyed when I get things on steam he wants to try, meaning if he wants to play it, we have to buy ANOTHER copy for him. :/ (but that was easily solved by the thought of "buy the games we both want on the PS3")
But even then, Fear 3 has shown me that even that's gonna disappear eventually. Who's smart ass idea was it to put a Steam copy on a disk?
But other than that I prefer steam because of no product keys and downloadable to any computer. If that's honestly how those guys think then god forbid they graduate.