Tiger data is not to bad. ways are connected correct for the most part. in fact motorways are connected to under/over crossing ways which is incorrect. But routing will be possible. A major problem is the direction of motorways/motorway_links. they are random. by default mkgmap sets them oneway and a single way can break routing.
I was just in San Diego and Orange county, and maps I built around 9/1 (with cloudmade extracts and svn mkgmap and splitter) actually seemed to route pretty well. That said, I do not dispute your statement above at all.
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