Three brackets two stops apart is usually good. From a tripod, I chimp until everything is exposed in one shot or another. If they are not too far apart, I pick three to process in Photomatix. Sometimes the three are far enough apart that you need to process five brackets.
Real photographer hate HDR. Most everybody else loves it.
I thought real photographer hates Photomatix and everyone else love those surreal look. LOL.
For the most part, that has been my experience. I personally know a real photographer that likes it, but the vast majority on this site detest it. There are a few real photographers on the net that use it, Trey Radcliff being one that comes to mind.
I've run into a few real estate people that don't like it and at least one non photographer that's not in real estate that doesn't like it.
I have some creative (or my attempt to be creative) photos that I display on my walls and have in a portfolio book in my living room. When people pick a favorite, without my discussing types of photography, they most often pick one of the HDRs.
When I first started doing HDR, mostly for real estate, I had some flyers done without it and some done with it. While not scientifically measured, I observed prospects eyes spending more time on flyers with HDR. Two agents I work with actually counted hits on Loopnet and MLS. The HDR shots generated more than double the hits.
There are always exceptions, but generally speaking, civilians love it, and photographers hate it.