I liked them a couple of years ago, then I canceled about a year ago or so.
However, I just canceled a subscription with them. I tried them for 2 months September-Oct. They've turned horrible shipping is slow. I had 15 xbox 360 games on my list. I had no chance of getting anything new, and if anything was older then 8 months you had no chance of getting it. I was only shipped 5 games in 2 months. Manly shitty games I picked just for achievements.
Right now I'm using Gameznflix and there not the greatest but far from the worst. I would give gameznflix a 7/10, and gamerang a 4/10.
Most people choose to use Gamefly, but for me they only ship out of the west coast. Which takes at least a week to get to me in the midwest. Gameznflix has a distribution in Kentucky. Which is a state away from me.
When it comes to choosing a rental service. It really comes down to; how they ship, availability of product, and shipping times. Find what place is closest to you then give them a try.