It's barely even DRM... it's more like you just have to be logged in to Steam to launch online games or games that specifically require an Internet connection.

I've started Steam in offline mode to play my singleplayer games whenever I don't have an internet connection quite often, and without issue.

But I agree, his 0.2 MB/s connection is probably the main problem there. The issue isn't with Steam's download speeds... it's with his ISP's.