If you are going to shoot HDR then you should try to make the images look as real as possible. All of these seem oversaturated and have heavy halos. The processing here takes away from these images rather than adding to them.
That's your opinion

I don't think samu's shots are overcooked.
samu, the most important sliders in Photomatix (I'm using version 4.01, but I don't think they've changed very much of the sliders) is the smoothness buttons (I'm not in light mode). I very rarely go under "medium", and try stay at High. For certain scenes, Medium works very well. I go as high as I feel I can. One other of the "key" sliders, is the Highlights smoothing slider. Halos around trees and stuff are easily minimized by upping this slider. Micro smoothing I sometimes pull up (when I have lots of sky, for example), or sometimes leave far down (when I want textures in wood, stones, bricks etc).
White point is another important, which basically lets you determine which values should be considered as "white" in your scene. When I adjust brightness of the scene, I adjust white point, black point, lumosity and gamma.
If you get cartoony images, just choose High on the smooting bar, and adjust other sliders thereafter to get a good starting point as possible for touch ups
At least that's in short how I work in Photomatix
edit: you have good gear! Ultra wide angle is pretty much the only lens I ever use (Tokina 11-16). So fun.