The  issue I think that most of  us that are upset with the settlement is the quantum. $10.5 million seems  a little excessive, don't you think?!? Mr. Arar's settlement was very distinct from this situation. "We", the Canadian government through our police forces' misinformation led directly to the detention and torture of Mr. Arar. We were the cause of his misfortune - we pay!. I have no issue with the apology to Mr. Khadr, we did screw up, but not to the extent / scope as with Mr. Arar. The U.S. had control of Mr. Khadr and they were not going to give him up. Seems to me that we had a "panic" to settle, not  a reasoned and measured consideration of the degree our actions had on Mr. Khadr's ordeal.
The result, outrage and frustration by a large segment of the Canadian population. Time will tell if it has any  lasting political affect.