It's good if you have a lot of free time and like to play a lot of different games, however, there's games that I'd love to spend ages on. I'd love the option to purchase a game instead, I don't really want to pay for a service just to play one game.
Also, from what I can tell, dependent on your connection, you can witness buffering. I was using a wireless connection when I used the trial and it constantly buffered and crashed.