HDR is a tool. Personally, although this is a fairly new hobby of mine, I feel that calling a shot an "HDR shot" is no different than calling it a "Digital camera shot" or a "flash shot" or a "5.6 aperture shot". It doesn't need to have a separate class as it can integrate seemlessly into any other collection of shots. Now, having said that, there are un-realistically processed shots.... whether that be HDR, levels, saturation, whatever.... but HDR, when used as intended, should appear no differently than any other properly exposed and naturally processed shot, in my humble opinion.
The only one of these that I like is #3, but it seems underexposed, at least from where I'm sitting. It's got nice reflections and light.
I'd like to see a full DOF on #1... the interest in the red squiggle is quickly fleeting and my eyes are drawn to the end of the tunnel which unfortunately is out of focus.
#2... my interest is on what is written, but it's too small for me to read. The color difference between foreground and background is strange.
#4 just looks severely underexposed with a properly exposed and oversaturated weed.