Poor you. Did you not use the bypass?
Nah, no pussy footing about. I went from Exmouth to Minehead via the sensible combination of M5 and A358, but decided to get a bit more adventurous for the return trek, taking the A39 with all it's trecherous obstacles like Porlock Hill et al.
Thing to remember is that the source came from outer space. So your house is, in a nutshell, too small and insignicifiant in the grand scale of things to turn up in any great detail compared to something bigger.
I'm sure some of the photography has got to be aerial photos as opposed to taken from space, there is a great deal of variation in the quality and style of some of the photography, and major cities are noticeably more detailed.