I agree with Ms Monny. If that type of expression is what the artist is trying to achieve, then yes, it can work well when it suits the image. I don't believe all HDRs have to look "natural", but i don't think they should all look artificial either. It's important that the processing benefits the image. By this i mean that the photographer should be trying to show something in particular that is not shown in a single exposure.

I think alot of people find it very easy to overcook a HDR image.... mainly due to the software used and the fact that the process itself leads to the oversaturation of colours.

Cheers