The wii was less powerful than the original xbox but had the novelty value of its controller. 24MB of main memory, 3MB of video and 64MB of slow memory for buffering, disc cache etc. 2 channel sound, 24bit colour and only ED resolution. It was never going to be capable of much and couldn't run the same games as PS3 or 360.
Even the ps2 had 32bit colour and 5.1 sound and even had high resolution 1080i games like gran turismo, none of which is possible on wii.
What does a software developer do when hardware is commercially successful but simply not powerful enough to run their mainstream games. I would suggest doing enhanced versions of previous generation software that the console is capable of running seems likely rather than the huge problem of trying to cut down and optimise code so it can run on wii. I don't think Sega were alone in treating the wii as a special case. I remember wii getting a special Need for Speed game that was awful because it couldn't run the ps3/360 need for speed game of the same time. I personally played more gamecube games on my wii than wii games. I keep my favourite gamecube games when I updated to wii and often found very little worth buying on wii and would fallback to my gamecube collection.
