There was certainly enough outcry about Steam when it first launched but that's now more than 10 years ago and it was a content distribution system, not a digital distribution or DRM service. It's grown to be those as well but that's only after a lot of development and a long time. Valve have built a reputation over the years for being trustworthy and a hell of a lot more gamer centric than the vast majority of publishers. The Steam hardware survey is probably the most accurate representation of gaming system specs in the world, Valve make SDKs available for modders and actively encourage them to make what they want of the software they provide, they promote indy studios by not charging exorbitant fees to make their software available, allow download of free to play games where they make nothing and are generally the champion of the every day gamer. It hasn't always been that way as we didn't half hate them when CS 1.6 was released along with the then extremely buggy Steam platform, they've put a lot of time and effort in to building customer base and loyalty with no secret made about the fact that you simply cannot transfer games if you buy from them - then they go and hold ridiculous sales that give me an acute case of wallet cramp! Steam also doesn't require always online, once a month is sufficient then you can go offline until prompted again. They've been known to extend this period on a per account basis for services personnel deployed overseas as well. Add on top of that the fact that you can literally install and play a Steam game on any system as long as you can install it, remember your log in details and it runs a supported OS then it really isn't the same.
In contrast, Microsoft have a reputation for shafting the consumer in general, releasing dodgy, bug ridden software (I consider new Windows launches to be an MMO beta test and Games for Windows Live has done SO well!) and hardware (RROD anyone?), change anything on a whim, already have draconian DRM (Windows reauthentication on changing hardware, seemingly triggered at random) and definitely don't show the same integrity. It isn't even an apples to oranges comparison, more a fish to bicycle one.
BTW, Valve have about 70% of the PC digital distribution market share and offer support for three PC operating systems so far (all be it slightly limited for two of them) as well as two console platforms. I could be wrong but I believe that they may have a larger market share than Microsoft where gaming is concerned - at least with regards to software.