Hi, Trouble with HDR is that people don't really no how to use it or when to use it, they go around and everything has got to be shot for HDR and although it seems to have kind of leveled off now some images where horrendous. If you wish to get realistic images from HDR choose your subject wisely and don't shoot 7 or 9 images just because your camera can do that, in many cases 3 images will do the job for you.
Although you state you have Photomatix do a search for other HDR software some are easier to use for a beginner and some a little more advanced but try before you buy.
I am way far from being an expert on the subject of HDR and still trying to get that natural look to any HDR images I shoot. I am attaching an image here from a hotel lobby that I took last Friday and to me it looks OK to others maybe not so but that is the other side of photography 'If you like it then it is good if you don't then use the delete key and try another image'.
Russ