I fear Starbound will turn out less like Disneyland, which is a functional masterpiece that will never be finished but constantly improved, and more like the Winchester House, constructed haphazardly and proceeding aimlessly without direction until its owner's death. The game has a more than decent framework, but the developers keep changing the game's premise, leading to a circuitous lack of progress and wasted potential.
It's gone from a Terraria-like 2d space exploration game with procedural worlds and craftable bosses, to a story-driven series of instance dungeons, all the while killing off promising older content while adding more and more unfinished (and/or unnecessary) features. This slash-and-burn development has left the game unfocused, long after the point where it should have been crystallizing. The initial hype has died down, releases are fewer and longer between, and content is stagnant for months at a time, leaving players wondering if there's any motivation or momentum left to see it completed.
The playstarbound website seems to feature lots of regular updates, but most of it seems to be showing off graphical blandishment and experimental features, few if any of which have rolled down to gameplay or promise to offer much in the way of functional content. In their eagerness to demonstrate that they are still actively working on the game, they're offering a lot of gravy and not much meat.
Players will quickly burn through all the existing gameplay content and acquire all the useful craftable equipment, leaving you with nothing to do but wander randomly generated worlds in search of treasure chests. Judging from the comments here and at other sites, many players have walked away due to the lack of content, and with them goes word-of-mouth support. After all, what good is an increasingly graphically refined game world if there's nothing new to do in it?