Diary and Survival leave a lot to be desired but i like both, but I definitely see more of the Romero commentary on humanity in both more than Land.
I especially love the final shot of Survival, both dead and equal but the fight continues mindlessly.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.