Google should be their main point of contact, Google decided how this was going to be sold and sadly underestimated what type of support people would need.
From what I can see in other news articles about the same 3G connectivity issues it would seem to be either the phone or firmware that has issues since I've seen quotes from people currently using Android devices on T-Mobile with good 3G signals and yet when they compare a Nexus One in the same location on the same account the signal reception is significantly weaker.
IMO this is one area Google should not have gotten involved in, if they want to be the sole point of purchase for this device (with a new version of the OS no less) then they should have been geared up to support via telephone not by two day turnaround emails, they might as well just ask people to send them letters by snail mail, it would be just as insulting.