The multiplayer is unplayable since patch 0.1.2.1 release.

[Chris_Holden5]

Since the release of the latest patch the game has become unplayable within multiplayer (Not tried shared world). The game will lag spike, crash the game, cause you to wrap into walls and interactions with buildings is crazy with not accepting materials of already partly built buildings or when relocating, it loses the blue print so you have to go back.