I use gamefly and its very hit or miss. I mean I guess it works really well but its better to have a 2 game plan and only have 2 games in your queue.
For example I could put Heavenly Sword (available alot) and Resistance 2 in my queue.
I'd get a billion games before every getting R2 if I had like 10 games in my queue. So I just keep a few games in there so that I only get games I want.
truthfully I'm using goozex alot now its pretty sweet
I'm too lazy to make a sig at the moment