I don't think repetition is problem in this industry. I think it boils down to the lack of attention that the game may have gathered in the building process, and it did not build a lot of hype in the beginning days,
This happens sometimes, but it should not be too discouraging. Some games don't catch on till later on, or years later. Every game is different as far as the mechanics goes, especially considering each owner as a different vision for their game. What works for one game, may not work for another.
However, I'm a strong believer that a questing system, along with mini games and social features should be implemented in every game.