Crytek boss Cevat Yerli has questioned the business model of Cloud gaming service OnLive, pointing to its lack of a "killer app" for launch.
Speaking in a CVG interview this week, Yerli said he had tested the service, but was uncertain about its "sustainability" in the current market.
However, Yerli did recognise the service as a "great first-mover" in the server-based gaming space.
"I used OnLive in a test condition," he said. "I haven't used it in a real world situation since it doesn't exist in Europe and in the US I barely have the time to try it out. When I did try it, it seemed to work, but I had question marks about the sustainability of the business model.
"It also lacks the killer app. These kind of platforms need a game that is exclusive to the platform, that shows it off and can't be done on other platforms.
"If it just becomes a redistribution service that is low-cost and accessible from the client side I don't think that's enough. But for example, if it launched with Crysis as an exclusive OnLive title it could have been a great argument for OnLive.
"I think OnLive is a great first mover, but there's still a rocky road there."
Crytek's Crysis 2, which has been hit by piracy problems, will be released for PC, 360 and PS3 next month.