Nah, 4g isn't really that new in terms of technology.
The problem is definitely phone-specific, in a way that the phone doesn't work with the network, not the other way around. My proof is that I have a Bionic with 4g-3g switching issues in my house, yet my Tbolt works just fine and I have traveled with it many times from the top of the country to the bottom.
I am in no way disregarding Tbolt folks with data issues, all I am saying is that maybe their phones don't work with their part of the network.
Sure, it could be Verizon's fault for not working closer with the phone manufacturers, but I would not buy this argument in the case of Moto. Point in case - instead of fixing the Bionic being their top priority - they go ahead and launch the Razr, likely with the same issues the Bionic has. This shows me that the do not care about their customers one bit.