There are a lot of Valve fanboys that seem to think this will automatically become an automatic success, but I think there are too many question marks to make it a big success. They will be, in some way, convenient to some people but it will be a product that doesn't have the strengths of pcs or consoles.

I see it being something like the mac mini, but for gaming. There is a market, but it's not going to satisfy the casuals (price vs consoles) nor the hardcore (power/upgrade ability vs pcs).