Forget that, the service has about 10 games. Total. No way am I going to make a long term investment of $50 per game into a service that can't grow its library with the new stuff coming out, and that could implode at any second.
How many of these games are exclusive to OnLive? How many of them have better experiences (multiplayer, controls, DLC) on other platforms like PS3 or XBOX 360? Pretty much all of them.