I think there's a couple factors in play here. Bengals away uniform is pretty much their white color rush uniforms with the lack of orange in it. Their new white helmet helps complete the white tiger look it seems they were aiming for. It makes the uniform better.
Regardless of everyone's opinion about Chicago's orange jersey, I think most would agree that the orange helmet makes the overall alternate uniform look worse, not better.
Then there's the history side of it. Chicago's uniforms are iconic and the orange helmet means the Bears are a step or two away from meddling with their classic home/away uniform.
Just my 2 cents but I think people were more receptive of Carolina and Houston because many believe both of those teams need new uniforms.