Posted November 29, 2014
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Library with tags so that you can organize your games;
Automatic downloads for patches;
Tracking stats;
Cards (i also don't care but making money out of it and buying new games with it is a plus);
You can get many games from cheap bundles or other website promotions (not that it's exactly a Steam feature but it does offer a steam key);
etc.
I don't mind having Steam and Gog but i can see why people prefer Steam only or why they don't want various game clients (and i'm one of them).