I didn't understand what the big deal was until I drove to downtown LA last night. Google Maps turn-by-turn directions instructed me to make a U turn in the middle of the 110S freeway (which would have crashed me into the center divider). Then, on the 10W, it kept trying to have me get off the freeway and then get right back on.
I don't know WTF happened, but this is an all-hands-on deck situation for Google: must fix ASAHP.
In a small town I know, I think they switched their data provider (I guess to the Census TIGER data). I don't have a great memory of what they had, but I recently noticed some alignment problems that I hadn't noticed in the past.
What I think I remember isn't a great point of reference, but a switch to a cheaper, lower quality data set would explain problems with routing.
I don't know WTF happened, but this is an all-hands-on deck situation for Google: must fix ASAHP.