Not much is mentioned about the network bandwidth.
We also know that there are network providers out there that love to cap and throttle the bandwidth.
Many people in Europe are stuck to a 15GB per month high speed internet limit. If the actual game is streamed over the internet like a video, you might end up using several gigabytes per day, even when only playing for a few hours!
On top of that, any wireless or routing connection will substantially increase latency, and decrease playability.
I suspect the only audience really benefiting from this technology, are the people running a laptop with a wired connection, as most desktops are easily upgradeable to a better video card; and the money you will be spending on bandwidth and hiring the game, in the end can be better invested in a cheap graphics card (like eg a Radeon 5750, which hopefully can be placed in a RAID/crossfire config.
The main 2 disadvantages are:
- you are always connection dependant (be it through the internet, or server downtimes)
- In the long term, you are paying more money for this service than just purchasing a balanced videocard (performance/price) and a couple of games on CD.