I've had my DX for about 3 months now. Running GB, rooted, odexed. I have had virtually 0 problems with GB or before that with Froyo. The few problems I have had I've been able to trace to applications (i.e remove the app and the problem goes away). I wish that before people speak about something being a major problem, that they give some context. What are you running, overclocked, major apps,..., If the DX were as bad as some people here seem to say, none of us would be here. I think generalities do not help any conversation, could mislead people, and are of no real value.
Just my .02.