Hmmm rooting a droid ...
For all intents and purposes there is absolutely no reason to root your DHD ...
The Stock ROM is pretty good and will handle pretty much all your requirements ...
One of the biggest benefits is to be able to install a custom ROM ... which can give some very cool tweaks.
RAM Optimizations
UI Tweaks
that sort of thing
http://www.addictivetips.com/mobile/top-10-reasons-to-root-your-android-phone-2/
http://lifehacker.com/5342237/five-great-reasons-to-root-your-android-phone
However being a geek ... It took me a month to eventually surrendered to temptation and rooted my DHD and installed a custom ROM
I am currently running the latest Leeroid 1.4 ROM with the accompanying radio flash
My Quadrant scores are slightly better but not by much ...
But saying the ... I do have to admit that the interface is a lot snappier to the Stock ROM ...
scrolling through the apps is a fast beautiful blur ...