Great point-by-point list, there. Even Palin's detractors would have a hard time arguing with it.
For a long time now, I've imagined some sort of spreadsheet, with all of the commonly-agreed upon essential positives (and deadly negatives) for a presidential candidate, listed in columns across the top. I'd then insert each likely contender's name in the far left hand column and proceed to grade each, on their relative strengths and weaknesses.
It's my contention that Palin would rate higher than the rest of the pack, in such an analysis.
There are honest detractors, but then most of the PDSers are just bad actors. Trust me, if that list were dangled in front of our "gang of twenty-four (less one pissant)", they would insult it for days and pout that she quit.