I've seen the specs and there it is a difference
Processors:
wii
CPU: , reportedly† clocked at 729 MHz
GPU: ATI GPU made 243 MHz
Those are for xbox(original)
CPU 733 MHz Intel Pentium III-based Mobile Celeron
GPU 233 MHz nVidia NV2A
So wii may be more powerful than xbox by being more efficient and can could handle the gameplay but it wouldn't be the similar and had to cut things out.
It doesn't have similar specs to Ps3 or Xbox360. Period.







