Wii vs PS3 device accuracy
I don't think we're really talking about the same things here.
The Wii has only accelerometers for placement, meaning it can't pinpoint positions of the controllers, but only estimate motion direction and speed and so forth using motion and gravity (to tell it which way is down). It doesn't even have a digital compass, which would at least help with locational awareness.
I was always somewhat disappointed by that on the Wii, you didn't truly feel like you were in control of your on-screen weapon/racket/golf club etc.
Reading about when Sonys version first came to light, I was under the belief that it COULD tell exactly where your controller is and how it was oriented. It makes sense because it involves a camera and a big glowy ball! Having this makes it all far more sophisticated and more, well, real.
Like most mickey mouse Wii sporting titles, you take a swing and you hit the ball EVERY TIME regardless of whether you have a swing technique.
With proper positional awareness on this thing, it at least introduces the possibility of a swing-and-a-miss meaning more skill can be leveraged to your advantage - games suddenly turn into proper tests of skill.
---Don't know if this is still the case tho.