Steams ability to do away with the game resale market.... not so nice.
But for me it is more then made up for by the ability to easily reinstall and update games, and by waiting just a bit and buying on one of Steams amazing sales I get pleanty of games cheap enough that I don't care about reselling them.
I also buy from D2D & GoG as well as steam but I find the automatic updates sometimes annoying, in some cases game breaking & it always forgets the "do not update" setting
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Steam is among my last places to buy software, I can normally get it elsewhere cheaper & with a nice box to go on a shelf. I do miss the olden days whewn manuals were like novels and not the leaflets you get now.
I no longer want boxes of games on my shelf. In the end it just takes up room and when I really want the game I have to hunt it down and hope all the disks are there. I much prefer to have a list of games that I can re-download and play. There are a number of games that I bought that I wish I could find my original disks to so I could re-install them and replay them now. I would really like to have a working copy of Grim Fandango right now, but while I have the box, the disks are missing.
As for the manual, I completely agree. I miss quality manuals as well, and I think that is something Steam could really improve on. If Steam would create a section for game manuals, where I could just click and see the manual for a new game (as a PDF or even better HTML) It might just tip me over the buy point sooner. I think that it would also encourage companies to produce quality manuals for games again, as they would then become a form of marketing, and they could distribute them electronically instead of having to print an expensive book and increases the cost of the physical packaging. Many games already have a PDF of the manual on the disk, but you often have to hunt around the file system to find it.