tfishell: I don't know if a bump for this thread is necessary or important, but I figured I'd try one here and see what happens. :P Honestly, I'm surprised that (apparently) a thread similar to this one hasn't been made before.
I'll see that bump and raise you a post...
I think I posted earlier just saying I like both Steam and GOG and not much else. I guess I'll give a little more detail now. By the way, it is nice to see this discussion have such a civil tone. :D
I've been using Steam for over nine years. In that time as Steam grew to become what it is today, I replaced my waning disc collection of games with digital versions on Steam. I liked having them all conveniently backed up online and available whenever and wherever I want. As a long time PC gamer, I particularly appreciated that I no longer needed to visit Fileplanet, etc. in search of patches, sometimes finding a multitude of them for just one game and needing to deal with storing them away, applying them all, etc. I consider it a major plus that Steam auto-updates games with patches as they become available. I suspect a fair number of old timers who had to deal with numerous downloadable patches appreciate it too. Of course, back in the day you often didn't even know if there was a patch at any given point in time. It was up to you to go looking and see if maybe there was one or not. With Steam, that hassle went away.
As Steam grew, the client was enhanced with a lot of nice features that added value for many customers including me. I like niceties like time tracking, built in screen shots with storage for them, the social feed to see what your friends are playing, recommending, etc. The community features are a real plus in my book which I especially enjoy since the recent addition of many new friends on Steam from GOG.
In the News section of the Steam client, you can not only read Steam news about updates, sales, etc. but there are sections for PC Gamer and others that are fun to look over. I was reading some PC Gamer articles this morning and come to find out they run a series where they reinstall good old games and write about them, including mentions of getting them at GOG. In fact, I added Tex Murphy Pandora Directive to my wishlist on GOG this morning after reading the PC Gamer article about it on Steam.
Of course, there is the multiplayer functionality built in, chat with friends and other features I am probably forgetting now. So for many gamers Steam is a lot more than just a form of DRM, it is a great digital store with excellent prices and a lot of value added via the client software.
The bad part for some of course is the DRM. Personally, I don't mind it at all because in my experience it has not been problematic. Other than the requirement that the client be running it isn't obtrusive, annoying or worse as some other forms of DRM are. I do find it highly annoying when some publishers insist on stacking their own DRM schemes on top of Steam. There is no need for one thing. But I blame the publisher and sometimes won't buy over it. It's not Steam's fault they choose this.
So in summary, over the years Steam has continued to improve and offer me convenience and value added features while offering excellent deals on PC games during sale times. I forgot to mention, I think the achievements in Steam are also a nice value add. Many find them fun, including me.
For all things new, I prefer Steam almost without exception. I like having the majority of my games under one roof. For Good Old Games of course I turn to GOG. If it isn't on Steam, I look to GOG. If it isn't on Steam or GOG, I resort to Amazon.com but the need to do that is rare. Three accounts to keep track of is enough for me. I can't be bothered shopping at other digital retailers personally. Those are my favorites and they have each consistently done right by me over the years so good enough for me.
To each their own though. I respect that. I can understand the appeal of getting the best deals by diversifying where you buy for example. I can also certainly understand someone choosing different favorites than I choose. But for me, Steam is awesome for some stuff, GOG is awesome for other stuff and Amazon.com is where I can find what they don't have, like ME3 or Kingdoms of Amalur or Age of Empires II, etc.