Steam still scares me in that if for some unforeseeable reason they go out of business and disappear (not likely, but gotta consider every scenario), what happens to my games? Do they disappear too?
However, I do prefer it against alternative DRMs. Of course, the best DRM is no DRM. I would even say that I'm more likely to buy a DRM-free game. For example, the game Demigod. No DRM. I downloaded a pirated copy to see if it was any good. I liked it. I got rid of said pirated copy and bought the game. If the game had DRM preventing the pirated copy, I never would have tried it, and never would have bought it.