This is the latest entry in Lego's long line of nearly identical games. If you've played Star Wars, Indiana Jones, Lord of the Rings, Hobbit, or any of the others, it's all pretty much the same - 1 or 2 players, building stuff, collecting studs, levels loosely based on the source material.
The problem is that, just like the other games, the makers think that updates and bug fixes are unnecessary. So there are glitches galore - step too far one direction or hit one wrong button, and the game freezes. Sometimes it just refuses to load whatever it's supposed to load, and you're stuck in an area with no way out. Sometimes the minigames won't work, and cutscenes glitch, and the game is unplayable.
If you can play this for an hour without having to reset your XBox, congratulations! That's more than me and my kids are able to get.
It's a fun game - fun enough that it kind of hurts to call it unplayable due to bugs.