We have updated results for the Pathfinder to include owner experiences through December 31, 2010. Other sources of car reliability information won't cover the months since April until the summer or even fall of this year.
Repair frequencies, in terms of repair trips per 100 cars per year:
2008: 90, about average, but not far from "worse than average"
2007: 159, worse than average
2006: 24, better than average
2005: 27, better than average
In all four cases the sample sizes are small, even very small for all but the 2005. This might explain some of the huge difference between the first two and last two years but probably not all of it.
Common problems for the 2007 and 2008 include radiator leaks (which can cause transmission failures), the fuel sending unit, and possibly also the steering angle sensor.
Thank you, once again, to everyone who has been helping. We'll have further updates in May and August. With more participants, we could provide more precise information and cover all model years.
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Nissan Pathfinder reliability ratings and comparisons