Yeah, I remember when I bought DD it was a big surprise, 'cause I hadn't really thought much of it from the box or hype. It was funny and enthralling, and extremely well made with only a fraction of the money big companies can throw at it. You can see the heart Larian put into that game, and that's what makes it so good. If you've got something like that, you don't need the latest graphic engine and famous voice actors.
If you want another surprise, check out this Russian game called Evil Islands. It's from some unknown company, with unknown publisher, an unknown game. It's old, it's tacky, it's the cheapest game I ever bought (2€ new) and it gave me a whole lot more fun than many expensive games have. Had some good concepts too, and though, like in most european games, the English voice acting was awful, it was godawful to the point that it was incredibly funny.
Haha, man, I could never count the games I've played, but there are a whole lot, mostly RPG's and action games (no fps though). But there are tons of games I consider guarded secrets; great games too few people know about. DD is one of those.
I hope, perhaps, Ego Draconis will be the public secret; the great game everybody knows about.