It's an interesting selection although I'm not sure some of them would feature in my top 15 list...
I saw the link to this article when I was looking at the article you posted about the English castles. I've only been to 4 of these as well, and was not in love with Edinburgh Castle and Cawdor. Both were kind of "meh" to me (although I know I'm in the minority with regards to that). :-) I like ruins better anyway, and was happy to see Slains Castle on the list.
Kilchurn Castle looks like it's in a gorgeous setting, and Dunrobin Castle looks pretty impressive, too. I will have to add those to my list. Thanks, wasleys!