It could be because some one doesn't like the Resolute look, or they hate Duke, or they don't like you, etc. The list could really go on and on like that.
I think a lot of people really neglect all the effort that goes into this aspect of the hobby. There's settings, set ups, figures, accessorizing, lighting, possibly construction, time, lots of patientce, and that doesn't even include the actuall photography aspect. Then someone comes along and rates it a two or three because you used Snake Eyes v3 and they hate him.
