It's a good idea to have an organized place for discussing the lag issue in BT3. It's such a shame that the online is so broken because the game is so fun.
What's worse, however, is this: Atari knows how to fix it, but they are dragging their feet in doing so. I've been working with a couple of people over on Atari's community forum to get Atari to fix their game. We have a lot of research, and some extremely solid arguments, about getting the game fixed.
Having an organized thread such as this is definitely a good start for getting the game fixed.
If you want to see what where we stand and how we got there, check out our most up-to-date collection of research and rhetoric on our blog/site: http://fixbudokai.blogspot.com
I hate to advertise, and that isn't my intent here. I have nothing to sell. I just want to get the word out about where Atari's problem is, along with uniting disappointed fans, so that the necessary pressure to get a fix can be applied.
Forgive me if this is considered advertising.