Constructive, like this post?
;)

Didn't want to post here at first but I'll say this: the return on investment I get with Steam is great. Why?
I have absolutely no worries that Steam/Valve will go belly-up soon and this moots the point that GOG lets me download and backup the installers (how many of you actually keep them after you installed the game?).
I also get a one-stop-shop for buying games, installing owned games (by the way, what you're buying from GOG is a license, just as with Steam and a physical disc), community aspects such as groups and friend management.
Steamworks integration is great: I can be playing Trials 2 and a friend can invite me to a game of TF2 and I just follow him into the game, one click is all it takes to start the game and connect to the server. Besides this we have data synchronization and backup for a select few games who bothered to implement that.
Prices are OK even compared to local shops: the before mentioned aspects are worth the difference in most cases. Also, sales have nice offers from time to time and last years Christmas sale kicked ass (Bioshock for 5 pounds, Civ 3 complete for around the same price, Civ 4 + expansion for around 7 pounds from what I remember).
I'm OK with DRM as long as it's well made and managed and Steam does this for me; I don't share an account, I don't expect to have Steam running on more than one PC at a time, they mostly strip other DRM schemes for the games released on Steam (if not always when they're released).
Also, nice new integration with Windows 7 (jump lists and download overlay on the taskbar icon).
Not to say that if a game is cheaper here I will buy it on Steam but if they are equally priced I'd have to consider very carefully if the extra material offered by GOG is worth the community and IM integration.
If it's cheaper, sorry GOG but I'm buying it from there.
Also, this is my own personal take on it, I'm not arguing that you should share my opinion but it saddens me to see so much bashing (some of which is even based only on hearsay and word of mouth FUD).

Okay, I'll bite...WHAT?! So buying from Steam...is Anti-HUMAN.
Gaming is not IN ANY WAY covered as a 'human right'.
Love the jingoism at the end, though.

Indeed, sir. I see that you enjoy working with wood. I like that.

I'd go Impulse Driven by Stardock before i would get or use steam.

I realize this is a bit late in the game, but this is how I feel about Steam. I only use Steam when absolutely necessary to play Portal or Half-Life. If it wasn't for that, I'd never likely use Steam. When I was planning to buy Spore Galaxy Edition some time back, I checked out the prices on Steam first, because I'd heard good things. Turns out I'd heard wrong and it was higher than any of the other pricings I found, mainly on Amazon, which is where I ended up getting it.
I actually prefer physical copies of games I own. It's the only downside to GOG that I know of. But all the good pricings, selections, and bonus material make up for it.

You can make your own physical copies of the games from GOG once you've downloaded them, should you really want to have physical copies. That's the thing about having no DRM.

Steam is the first step towards One World Government and the New World Order!
/tin-foil hat

One love bruddah.

I just messed up the quote but this is addressed to flybyu. His remark is in quotes.
"I'd like GoG.com to post if you actually have bought any games here or are a anti Gog.com spammer."
I don't know why I am humoring you, but this is the best I can do.
and I am not anti-gog. I am anti- "if you use steam at all you must be an idiot " type comments though

If you think those prices are bad, just check out d2d's.

I've heard so many rumors, I've read so many complaints here and there about Steam that whether this is true or not, I won't take any risk and get frustrated for a game. I'll stick to GoG as long as they keep the same attitude.
Also, it seems harder for some people to stop using Steam (even though they are very upset about it) than quit smoking.
"I hate Steam but I have over 50 games"... go figure.

You know, it's kind of the default state; I mean, it's normal to see more people complaining than praising because let's be honest, most of the people who enjoy Steam and don't have any issues with it aren't going to post about it online starting topics in which the only content would be "Steam works, I'm OK with it".
Compared to this it's normal for people with problems to post at every occasion bashing the service which in turn leads to situations like the one above: Cambrey hasn't tried Steam and won't because of word of mouth and not because he actually gave it a chance and found that it didn't fit his needs.
And this comes from someone with 56 games and not one issue.

That is true. But I also take note of the bad comments because I consider that people who complain are not all liars and idiots who don't know what they are talking about.
I don't use Steam mainly because GoG's catalog satisfies me the most.