The packaging is quite nice, as people stated It's actually a silver case, with the rusty colored doom logo slip on case over the front. The gamestop deal with extra "lord of hell" figure and poster I have mixed impressions about. The poster is very nice, but the figure itself is smaller then the Ryu Bust I got with SF:AC, and is a joke. I'm hoping it fetchs a pretty penny on eBay someday.
All the content being on one disc doesn't bother me at all, but I would be bothered if all the Halo 2 extra content was able to fit on one disc, since they double stacked them with the CE and gave some people a nice scratch.
I have yet to touch the game, but the packaging is quite nice. Probably the best console LE/CE boxing yet so far, although the DBZ Budokai 3 with dragon ball looked pretty damn good.