Okay I'm no expert by ANY means, but as far as I can tell Rooting your phone is just a fancy way of saying you can make your phone LOOK better with all of these "ROMS" (glorified themes). Sure you can freeze apps and such to save battery life, but the current OTA has certainly cured my DX of any battery issues I was having.
Will Rooting cure any of the MAJOR problems I have with my DX? Like for instance, the fact that Bluetooth is USELESS for sending large files such as music and ringtones. Verizon has that blocked. Also I would LOVE to use my phone as a mobile hotspot using the Tethering app I just found in the Market, but OH NO......Big Red has that blocked so I have to PAY them to use THEIR Mobile Hotspot feature.