From Dust looked interesting - It reminded me of the terraforming in Populous set to an obsessive degree. The thing that kept me from buying it was the lack of substantial conflict - As much variety as fighting nature gets, having something beyond that would have caught my interest. More buildings, NPC tribes, monsters, etc. There's only so much you can do with nature powers and a handful of tribesman.
Arkham I actually recall taking a few days at least, the initial cracks missed some major protections that didn't get too noticeable till later in the game.
Which is the way it should be done more often, rather than the burdensome and expensive systems that they throw along with every game. I'd hoped the Arkham DRM would be a beacon of light to focus on delaying hackers rather than making a system so convoluted that the consumer suffers instead of the pirate. Constantly introducing content patches that put more subtle but unobtrusive DRM (Like simple checks) would mean the pirates would have to keep fixing up their hacked version or risk it becoming obsolete - Consumers would be able to get content immediately and cheerfully, and if the hacking community moved on to bigger and better projects, those that use the illegal software would never be able to try out that amazingly cool new hat or whatever.