From the framerate perspective, the Wii has plenty of horsepower. It lacks the programmable shaders of the original XBox GPU, but if you're willing to limit yourself to old school rendering methods, your Wii game should have a great framerate.
Once you get over the fact that its in 480p, and realize that you don't need normal maps, multitexturing, self-shadowing, streaming textures off a HDD, etc. for a game to look decent and be fun, the Wii is a fine game system. The PS2 is still a fine game system too. That's why it still sells.
The blue ocean demographic has "spoken" about how they feel about HD and high-performance graphics. They don't care. They Wii. Comparisons are pointless discussions, trying to pretend that the Wii "sucks" or something merely because its GPU is most definately stuck in 2002. The Wii still owns as much marketshare, of the current gen, as the PS3 and X360 combined. Apparently, GPU (and CPU) doesn't matter as much as some might think.
As far as "defending" the Wii's architecture as being even remotely close to the X360 or PS3... lol. I still have no idea why people even bother arguing that the Wii can look good, from a purely technical standpoint. It can't compare to the PS360 from that, very limited I might add, point-of-view -- not by a longshot. I would argue that SM64 looks fine, in this day and age, at 480i. It has nothing to do with its techincal merits.
