i agree with all above...
There is only 2 that look dynamic. the one of the two im referring to is questionable.
Picture #1 and #4. # 4 is questionable, like mentioned, little detail and very dark. On B&W HDR try to set your bracketing more towards over, so you have maybe 3 frames over and 2 under...ect.
Remember, when shooting black & white, you have to vision what the shot will look like in black and white. the shadows being your darkest points, midtons being more on the gray scale/side of things, and highlights being your whites.
Also, when converting your b&w in photoshop its not a true b&w. a little post-process should be done. slightly... bumping up the contrast. boosting the blacks a little. and checking your histogram and curves to ensure your getting a full range of blacks, grays, and whites to evenly ballance the picture.
once thats done, merdge them into HDR and youll be set. Try not to bump your threshold up to much if possible, to help keep the detail. In photoshop, it tends to wash it out a bit, especially when you need a high radius.
those are just simple pointers. im by far no professional at hdr's, but ive produced several nice looking ones. Im still experimenting with ideas and tricks to the HDR style. But, if you dont have good negitives to work with at first, your not going to have a good print. same situation on digital.
keep shootin and lets see some more.