I voted depending on quality if it's for a payware project :
then I expect near perfection

What I pay special attention to :
- VCs (historically correct and good looking)
- textures (both internal and external with clever use of the specular or reflective textures)
- a set of good sounds
- good shading on the external model, which must obviously be  accurate.
- damage model with good-looking and realistic endcaps.

That's about it 

and remember, the real He.162 was a pain in the posterior to handle by an expert pilot, let alone by a half-trained kid!