A great collection of classic RPGs!
First i'd like to state that none of the games in this collection are bad, but they also aren't equally good, so I'll just list them in order of my preference:
1. Dark Sun: Shattered Lands is the greatest game of the pack. Solid combat, great story and interesting setting. I liked this one the best even if I've never liked the world of Dark Sun.
2. Dark Sun: Wake of the Ravager is the sequel to Shattered Lands. Improved graphics, but essentially more of the same. For some reason there were much more bugs in this game than in the previous one, which crashed the game quite frequently. Pretty solid, simple and fun.
3. Menzoberranzan is my third choice simply because I like Drizzt, who is one of the characters in the game. Beginning of Menzoberranzan is quite slow, but when you get underground, things improve. Oh, and it's in 3D!
4: Ravenloft: Strahd's Possession is very nice little game. It's not very enjoyable as AD&D-game, but I quess the world is great and has a eerie feeling to it, but I didn't care about the story or the characters.
5. Ravenloft: Stone Prophet is a sequel to the game above. Never got to play this, because I wouldn't complete the first game.
6. Al Qadim: The Genie's Curse was the most boring of the lot. Uninteresting setting, characters and there is no character customisation. What kind of RPG is that?
All in all, this is very entertaining collection. Even if there were just couple of interesting games in this collection, it'd still have that value for money (cash/hours -ratio).