Dark Cloud 2 was a surprise. I didn't like DC1, but man I loved DC2 (not to hump it like other users, but nonetheless!)
The first game threw me off with the thirst system, and the mechanics to build the 'perfect town' were also more complicated. The second game simplified the gameplay and house making to please everything very well, and tossed in other stuff that made it fun, like Spheda and medal hunting. It's not necessary to complete the game, but it's a fun side thing.
The story might have been somewhat Disney-esque (in which most bad guys are not really evil, just misunderstood or manipulated in the end, and almost noone dies!), but it was simple and solid up to the end of it. No real gaping plotholes or convulated story that makes you have to go back to 15 chapters before to understand what they mean.
All in all, it was a great game that went under the radar of many people, and a highly recommended game to add to your retro-collection of PS2 games if you find a copy. Here's hoping for PSN releases or remakes.