To prove it to yourself simply type "steam failed to" into Google and then see all the suggestions which popup like "steam failed to connect" and "steam failed to contact key server". Then click on some of the links.
I've had one or maybe two instances of steam not launching a game due to a decryption error on purchase, but I have over 20 games on it so it doesn't bother me. Using google to prove a point though? Try typing "how to pimp slap" into google, and look at the results. Must be a lot of people out there who don't know how to pimp slap, eh? I'm sorry, but you can type just about anything you have a problem with into google and get a decent number of hits, especially with things more people are involved in or use.