...There's always one!
The atmosphere would be how well it matches into the WFB world. But if you are worried then you could make a thread on the subject of the mini/army/back history. I did say you could do this in the original rules ..way back...
For an example most people know what a Grey Hunter is and how it fits into the 40K world, so it would be easy to for people to rate.
If anyone is bothered, by this then please feel free to make a thread about your mini's army and background.