I haven't played TOS yet, I'm hoping to enjoy it.
I was disappointed in Myst Exile too. Beautiful graphics, but it just seemed like huge connecting puzzles and soooo cold. It lacked something the others had. I'll start it over one of these days and give it another shot though. Maybe I just wasn't in the mood.
I was also disappointed in Chateau D'or. I kept a watch on the screenshots and just drooled. Although it was a pretty game, the length and the school work were less than desirable. And I payed over $40 for it.