Alright, so I'll probably be smeared for this, but I just wanted to put my opinion out there. Whenever I get a new phone I always get it on day 1. I have never had a phone that didn't ship with issues: Palm Centro, Iphone 3g, HTC Touch Pro 2, Droid X, and Droid 3 to name a few. Usually an update is released shortly after the phone gets a decent following.
For the Droid 3 it seems that there may be an issue with the radio and battery life. I know that the cell standby battery usage shouldn't be that high.
If you root now, the exploit will be patched when the first update comes. If root is found, I hope whoever finds it doesn't release it until the update rolls out.
Just my .02, I'd rather enjoy the phone a little bit as Moto intended before doing any tweaking. The phone seems pretty solid to me and I really like it.