Even though I despise DRM, I don’t consider it a good excuse to pirate games.
First there are the ethical considerations. Pirating a game is stealing. If you want to play a game then you should pay for it. If you think it is too expensive, if you don’t like the DRM it comes with, then just don’t play it. I can see using pirated games as demos, but that’s really the only exception to the rule.
Beyond the ethics, there are very good practical reasons not to pirate.
First, you you never know what you’re getting when you download a cracked copy of a game. Key loggers, viruses, root kits, who knows what kind of malware has been dropped into that unlocked copy of Whatever 5. Sure you can limit where you get stuff from and use anti-virus and anti-malware, but that’s no guarantee. Oh, and yeah, I know some people consider certain DRM programs to be viruses or malware, at that point see the ethical responses above.
Second, if you buy a DRMed game and then download a utility to strip it out then the publisher and developer don’t see any impact to their sales. Which means they won’t understand their mistakes. They’ll continue to add DRM layers to their games. One exception to this is Spore, but there’s very few games that will garner that kind of publicity.