While certain developers at Epic and Valve are uncertain that motion controls would work well with the games they make, at least one is willing to entertain the idea. Speaking to Play Magazine [thanks Now Gamer], Tecmo Koei president Kenji Matsubara expressed interest in the PS3 motion controller shown off at E3.
"I’m very interested in the new motion-control technology announced at E3, but we really need to know how responsive it is,” Matsubara explained. “I’m sure that for casual games these motion controls will be very popular, but for action games like Ninja Gaiden we need quick responses and if you're swinging your arms around like you’re using a sword you will soon be tired.”
“Maybe we have to change the playing style and check the technology to see how quick it can be,” he continued. “So, at first it will be casual games and then maybe hardcore games and we have to prepare for that and provide the games to satisfy that playing style.”
The recent Ninja Gaiden games have been incredibly fast; they'd have to be rejiggered a great deal in order to accommodate motion controls.

