Well, Wii's CPU is apparently does very well clock-to-clock with Xenon. There was even one report that claimed that a single core in Xenon only did 20% better performance than Broadway despite the significant clock-speed difference.
That's because xenon and cell are crap at general processing, and they're in-order at that.
Also, broadway had 4 execution stages versus roughly 30 on xenon/cell and that was hampered further with a 5% cache miss with no prediction applied. Some of you will remember how Pentium 4 underperformed despite it's clock-rate; well, that was because it had lenghtned it's stage pipeline big time (and that means data takes more time to get across, and if shit happens it takes more cycle time to clean out); but it kept out-of-order execution, smt and cache miss prediction.
They did it in order to have more GFlops (more MHz for the FPU); simplified the whole CPU and lengthned it's pipeline to no end, that made them less than stellar cpu's for their core task.
But being able to beat that doesn't exactly make this cpu that good; I mean, it's not hard to do.
As for it being a PPC based on a G3 core, that's kinda ridiculous; I doubt it; they have lots of better mass produced options to pick from. And I'm pretty sure they did.
As for Dead Rising it is possible that the GPU and/or RAM could have been the limitation before the CPU, though I don't know about that port.
Dead Rising Wii? that wasn't a port, it was retooling of assets by TOSE into the RE4 engine; no source code shared.
Porting that one would be hard to do, it was one of the first titles using the 3 cores on X360, so I've heard they basically went crazy with it, filled all the overhead they could find with AI and crunched the rest so they had more overhead for it too, so later the prospect of a PS3 port was to be difficult as nails (hence, it didn't happen). It basically turned into a technological exclusive, couldn't be ported elsewhere without rewriting the AI big time or cutting down the number of zombies a lot.
At the same clock speed as a 360 the Wii CPU would crush the 360 in single-threaded performance.
In dhrystones, yes.
In whetstones no dice, but it's not for whetstone performance that we want our cpu's for so...