Wii's motion sensing controls makes an impact of its own compared to the CPU/GPU combinations of competing next-gen consoles
Game Informer taps into Valve Software's Gabe Newell over development on the upcoming Half-Life 2 episodes and the virtual store shelves of Steam. Newell also touches base on producing titles for the latest batch of consoles, expressing a great deal of encouragement for Nintendo's Wii platform in particular.
The Wii is clearly a different kettle of fish compared to the PlayStation 3 and Xbox 360, and development for the platform stands to be a "valuable" experience. Additionally, Newell points out Valve's current lack of Wii titles from Valve for example as an "obvious hole" which stands to be filled somehow.
I think the Wii represents more of a challenge because of its input. You can think of the Xbox 360 as pretty much a PC and a PlayStation as kind of a PC. The Wii gives you a bunch of problems that don’t fit into that model. You can’t think of it as graphics, CPU, texture bandwith scaling, you have to think of it as more fundamentally, and I think it’s more valuable. I think it’s more interesting than just graphics chip – CPU combination. It’s the machine I have at home. The fact that we don’t have anything in development on it even though it represents big opportunities as a whole, it’s an obvious hole in our strategy.