Alright, I'm necroing this thread because I actually managed to get into the year beta and I thought I'd post my initial thoughts. Haven't messed around with it all that much just yet, but I will continue checking things out over the week.
So far the service actually works much better than I expected. command input lag is quite noticeable, and in a twitchy game I can see it absolutely murdering people, but in the games I've tested it with it works for the most part.
The graphics settings for games are pretty decent, not quite to the levels you could get with your own PC, but quite playable. The color seems just ever so slightly off to me on everything I've played. It feels slightly washed out if that makes any sense. Colors just don't seem as vibrant as they're supposed to be. I'm not sure if that's an actual issue or if I just have a terrible eye for color though.
Pricing is a goddamn crime on the service though. As we all know you have to subscribe to Onlive normally. In the beta it's a free year and if you get in you have the option of getting a second year for $4.95/month, not sure what the final sub pricing will be. The games are outrageously priced.
The pricing models I've seen thus far are FreePlay, you can play the game for as long as it's on the service, and then Rental, which is 3 - 5 days. Splinter Cell only has FreePlay and it is the full $60.
FUCK
THAT
SHIT
So yeah, this is only a beta, so there's not a massive number of people fucking with the servers just yet, but it's working out much much better than I had anticipated, but unless the pricing is made more reasonable, it's utter bullshit.