Generally someone wouldnt expect an empty alpha to be the final product. Many thought they were holding back content considering they kept saying how huge the game was.
The beta was basically one world and 1 mode of PvP on 2 maps. With the occasional extra mode or 1 mission on the moon. If that isn't holding back content what is? It was 25% of the game basically and how many of us played for 30+ hours?