I'll admit it—I was in love with the Nintendo Wii long before we'd ever met. And then, a few seconds after I touched those strange, new motion-sensing controllers, months of giddy anticipation vanished. I've played and won 14-hour-long Halo tournaments. I was a bird-slaughtering Duck Hunt master back when Times Square still had arcades. But the Wii, which is being marketed as the ideal system for newbies, made me feel like an incompetent novice. I don't blame myself. The ugly truth is that the Wii's already-legendary motion-detection system doesn't work very well.