As usual, I think it's just about what you're looking for and how you challenge yourself.

Honestly, some people...myself included...can't really just sit and play the game for hours. So being able to check in from time to time is nice for me.

I think if I were to play a game that needed constant attention, I wouldn't do so well.

So far, the game suits me because I can check in for a short time several times a day but not be required to focus so much attention to game play.