Here is the deal
1. It's new, ARM based Google TV devices are just recently released, it will take some time for the app stores to recognize them and allow installation of apps that work, but they key is that unlike the Atom based systems, most apps should work
2. It's Vizio and they actually support their product, I think they have already shown what they are going to be like to deal with in releasing a patch in the first week of release.
3. It's going to be rough around the edges until they move up from honeycomb, just because JB on phones does not mean they would leave it out for devices, the decision was based on battery life, and there is no way Google would release a tv product without it.. if anything else it will force Amazon to make an actual app, which would not be a bad thing (they already have it, but so far just want to keep it on the fire because they can).
Currently the device is not much better than previous GTV devices, but given some time for devs to open up their apps for testing on it, the potential is there in spades.