Megaboz: I've been with Steam for a long time now, and while the DRM aspect of it is obviously everyone's largest complaint, the platform does offer quite a bit more than just a centralized place for downloads and game inventory. The updating and content delivery (I've not had an issue with this that some other people seem to have), network/multiplayer infrastructure, title availability, cloud save games, etc are all awesome features. I've felt very comfortable with splitting my purchasing between GOG and Steam, they both serve their purposes and niches.
Theoclymenus: The "extra features" which Steam offers are utterly trivial and unimportant. Who cares about "achievements"', for instance ? I can't believe that this feature is so important to some gamers : it is just a gimmick and nothing more.
Not everyone does care about "achievements", like you (nor me). However, like you say, some people do, regardless of if I view it as a gimmick or not. Everyone games for different reasons - relaxation, entertainment, competition, etc. Those who do it for competition and prizes (which a lot of Valve gamers are by nature of the games) probably appreciate the achievements aspect more than someone who doesn't. But the "achievements" are only one aspect of the few examples I mentioned (multiplayer infrastructure, title availability, cloud saves) - all of which are important to me, personally.
Theoclymenus: As regards client updates, if you use Steam regularly then you will inevitably suffer less than someone who uses it only now and again. But it really shouldn't make any difference how long it has been since you last played a game : it should always load IMMEDIATELY and you should always be able to play it IMMEDIATELY. As regards game updates, you should have the freedom to update a game only if and and when you want to : it should NEVER be a compulsory, automatic process under the control of a third party. You've already paid for a finished product, after all : you should be in TOTAL control of the item you have purchased as soon as you have purchased it. The way Steam operates is criminal, and it's my hope that in the future this will be recognised and the company will be punished and closed down.
You feel pretty passionately about forced game updates, which I'm sure other people agree with. However, a lot of people (myself included) aren't bothered by this. Again, I was trying to stress with my post that for my situation, I like using both Steam and GOG, and others who identity with my situation may as well. If it doesn't fit for you, then that's cool too, don't use it. But to "punish and close down the company" is a bit extreme - there are actual criminal organizations hurting people in real ways out there that deserve this time and attention - not a gaming company.