Akhiris: Steam is probably the most unobtrusive DRM you will encounter. Valve always said that if they were going to shut down the servers that they would unlock the games and you would have them forever.
Gandos: People constantly say that Steam is the least obtrusive form of DRM, but that's not actually true. The CD check version of SecuROM was the least obtrusive form of DRM to the point that it hardly qualified as DRM, since it didn't prevent you from doing almost anything you wanted with your game (whether it be to back it up, borrow it or sell it). While Steam is not the worst form of DRM (although I have no idea why people would tout this as something praiseworthy), having to go online to install your game and have it permanently attached to an account with no chance of removal is certainly quite obtrusive, especially for a single-player game.
Also, the whole "
Valve said they would unlock the games if Steam shut down" thing is an urban legend. Newell never said anything of the sort and, honestly, the claim never made much sense to begin with.
In any event, I sympathise with the OP. I also think his example illustrates well how people don't really become aware of the value of DRM-free until they've experienced the problems with DRM first-hand.
, I don't see how it was innocuous. I've never had a problem with Steam's DRM.