I'm not really sure how DRM relates to locked content on a decade-old Gamecube game.
Anyway, I'm listening to the latest episode of Giant Bombcast, and they spent a while talking about the SimCity debacle. What I took from that discussion was that EA doesn't try to be evil or anything (nobody at EA is saying, "This went well/we wanted this."), but as a company they don't really work hard at fighting that image with the consumer. DRM is a contentious subject, but it'd be naive to think that companies could do without it or similar measures. Piracy has hit the PC hard, and that fact is evident in the giant drop in PC exclusives and measures that publishers are using to protect their products--really, their investments. This isn't to say that EA or other companies can get off scot-free for crummy service or overly intrusive DRM, but I think fans and the gaming community on the whole need to look at it as a "'how,' not 'why'" issue.