I thought I'd buy Crysis 2 because I quite enjoyed Crysis 1. When I heard that there's some horrible DRM included, I decided not to buy it (I also didn't end up pirating it - I simply didn't play it at all). And after I learned that Crysis Warhead had some dumb version of SecuROM on it, I instantly uninstalled it and tried to remove any trace it might have left on my computer (which was very new at that time).
Fun fact: I never bought any Crysis game -- my brother did, and I got to play it too since it isn't attached to, ie., a Steam account.