Yup, check my home neighborhood and it is good coverage, but checked a rural area I know has houses around a lake (not just tiny fishing shacks, full-sized 200+m^2 houses) with addresses and electrical and telecom/internet service, but there there are no buildings shown. Plus, even though there is a lot of tree coverage, many of the houses are clearly visible in Google Satellite View, so it is unclear why they wouldn't have been picked up.
The reason, I would guess, is that it takes at least a couple satellite passes to be able to get the 3D data, and then a processing step to actually obtain it, and they've not done that for sparsely populated areas.
Cool stuff, but they still have work to do.