@Geek, cool test idea. I'm a photo geek too and have always been somewhat fascinated by HDR.
It's something that is usually overdone. I know I went overboard with it when I first dicovered it, and now try to tone it back.
I think a thin DOF inage looks okay with HDR if it's a typical object in focus on a blurred background. Whenever theres forground AND background bokeh, it gets a little messy. Also seems to work better on wide shots, usually landscapes or shots that have a lot to show, not as much on detail shots or close ups.That may be a false generalization, but it seems to sum up my opinion on what i've seen.
The idea of HDR is being able to see more dynamic range in a given scene than you can with a single exposure. That being siad, it lends itslef to certain kinds of shots more than others. Shallow DOF shots often get a lot of their impact from NOT having a whole lot of dynamic range.
Cheers to another geek.