2. the staff :D
What's So Great About Chess.com Anyway?
Sort:
3. The tournament
4. Great games.
5. the community
A place to play chess with my friends.
7. It's free! 
8. It's got heap of features.
User friendly.
Excellent tactics training!
11. The overall features...
ADK
12. Great Layout
13. so simply
15. Correspondence and live chess.
16. That you get more features than on any other site... FREE!
18. The endless quiz.
19. Very little cost to be a member and you get extra features for it !!
The diversity around a common theme
21. The helpful live chess admin
1. The friendliness of its members.