I've played only the first two games so far. They are absolutely recommendable. Don't expect hard puzzles or a great story though. All you can find is great fun.
Collecting games from different genres in the same list is a bad idea anyway. I mean, how can one compare Fallout with Footbal Manager 2007? What makes FM2007 a better game? Huge team database? Accurate simulation mechanics? Better training options?
21. Fallout
..
16. Max Payne 2: The Fall Of Max Payne
..
13. The Elder Scrolls IV: Oblivion
..
09. Battlefield 2
..
04. The Elder Scrolls III: Morrowind
What can I say?
I heard, from a completely unreliable source, that Spore has been pushed back to 2008....
http://www.eurogamer.net/article.php?article_id=76148
edit: I am slow
Well, DS1 and DS2 were the first two games of a new founded company. They were not the same caliber as the Supreme Commander. Not even close. I'll be pretty surprised if they make another smaller and simple title again.