My thoughts:
a) Strauss should have been captain. He and Fletcher work well together, and his batting was excellent when handed the extra responsibility. He can get his team to work to plans and is well-organised. While Flintoff can be talismanic, he does not have the strategical and organisational nous to be an Ashes-winning captain. He increases the pressure on himself to 'lead from the front' in batting, bowling and being in the slips.
b) I'm not entirely sure about the whole Jones/Read debate. Jones came back to first-class cricket with the intent on getting his confidence back with big scores. Jones averaged 28, 6 less than Read but still decent. But why, after Read is excellent behind the stumps and is getting good scores in front of them, is GoJo suddenly thrown back into the Test arena. It does nothing for team spirit as the players see him get back in simply because "he might be able to handle the pressure better than Read" (Fletcher). It does nothing for Reads confidence as he loses his place on the back of a couple of poor ODI scores. It mystifies me.
c) But not as much as the Monty/Giles decision. Giles has played no first-class cricket in a year prior to the Ashes tour. Monty Panesar has shown excellent talent and appears to have the ability to be a wicket-taker, something Giles has never been. To win a Test match, you need to take 20 wickets, so you need wicket takers. Monty is one of those.
Yes, Giles might be a better all-rounder (though he's still prone to dropping a catch, as Ponting and Hoggard can testify), but he represents an England team who are saying - "Alright, we'll take a drawn series". Australia sense that England do not believe they can win, and the defensive pick of Giles reflects this. We still would've lost to Australia (although Panesar might have made it a lot more difficult on a day 5 pitch), but we'd have made a positive decision in picking an attacking player who is young and has gained experience.
These are the mistakes we made at the start of the series. It is unlikely that we would have played much better, but we'd have served a far more potent threat to Australia than the one that we presented in them scoring 500+ two matches in a row.