My son and I have split a GameFly account since the beginning of June, which allows us each to have one console or handheld game rented at a time. Overall my experience with GameFly has been good. The service is cheaper than renting from a local store. Plus we can try games we otherwise wouldn't if we had to buy them.
If you're not familiar with GameFly, it is a web-based service similar to Netflix except they deal in console and handheld games. You create a list of games you want and when you return a game, they send the next one on the list subject to availability. The games come with a pre-paid shipping envelope for easy returns.
My son has had a few Wii and DS games. I had Marvel Ultimate alliance for a few weeks, but since than haven't been so lucky. First, I got a DS game for my daughter on my share of the account. Ariel's Undersea Adventure isn't much fun for Daddy. Second, we had a shipping problem with the Godfather for the Wii. After five days I got worried. At seven days I reported a problem.
They have a well designed interface for reporting problems. I selected the game from the two they'd sent, selected my problem, and then confirmed my selections. Voila. The next day they sent out a replacement copy of the Godfather. Impressed.
With a bit of luck, I'll be spending my nights as a thug in the Corleone family in a couple days.