Thank you for the warning. I almost bought this bare bones set and would have been seriously frustrated. I think most people would have preferred waiting a bit longer and getting a complete set with extras.
For those interested in the extras that should have been there and that are planned for the US release (as listed on Television Blend):
Spartacus DVD Bonus Features
"Spartacus: The Legend Retold"
"The Price Of Being A Gladiator"
"A Bloody Farewell"
"The Spoils Of War Revealed: Visual Effects"
"Adorning The Damned "
"The Mind Behind Spartacus"
Spartacus Blu-ray Bonus Features
All of the DVD Extras