Well, I wasn't able to play it (HL2) offline , but I think I did something wrong. The problem with steam was that I had to start it in order to play the game and it was resource-devouring for me at this time. Even more annoying was the thing that is patched all games without even asking me (I couldn't find any option to disable this) and devoured my inetrnet-connection (I had only ISDN at that time).
I think even iTunes has a better DRM than SecuRom. Yes, you need an internet-connection for the activation, but nafter it no longer. You can use 5 activation adn get one back when you deactivate it. The most funny part is, you can burn your music to a CD/DVD and even rip it back with iTunes to remove the DRM. Unfortunately I would never rip something with iTunes, I don't trust it's ripping quality. Yes, I know iTunes isn't good.
I just begin to ask my self, what kind to treatment will we "the paying cumosters" get next? - How about "Please deactive your hardware-/Software-Firewall, so that you can't see what our activation programs are doing" or "This game has to be installed on it's own partition and you are not allowed to install anything else it it"?