Overcooked, so the actual dynamic range in the image is out of whack. There is no comprehensible shadow / light ratio, everything is visible, where your brain wants to see contrast between light and dark. Looks very much like photomatix has been used. The 3rd image has the best ratio between dark and light, but overall there is a halo effect over each image, this kind of processing looks cool till you've seen it a few times, then it eventually makes your eyes hurt. There's a few better options for blending exposures than photomatix, if you're using photoshop, you can go to file > automate > merge to HDR pro, and create a 32 bit image which you can then tone in ACR, gives you a whole pile of extra range on your exposure and shadow/highlight adjustments, etc, can often be more natural looking. More powerful still is luminosity masking, check out this tutorial here : http://iso.500px.com/luminosity-masks-in-digital-blending/ and grab his action set if you don't want to go through the laborious chore of setting up luminosity mask actions yourself. I have a friend who is a landscape/cityscape photographer and he manually pastes all his HDR layers into a single file, then uses regular masks to paint in areas from the different exposures between layers, which also looks pretty natural but is far too time intensive for my liking! The composition of the images is really good, just the toning that is over the top. The added boost to local contrast in photomatix that brings out grungy detail and such can fool you into thinking you have enough shadow and such after you've been looking at the images for a while.