You know guys, once there was a time, where games' graphics were compared to the console they were on. Happened to NES and Master System, happened to SNES and Mega Drive/Genesis. The MD/Genesis had better graphics to offer then the SNES, but this wouldn't cost the SNES-game score points in the graphics section). Happened as well to Game Boy and Game Gear. Maybe I was pretty young back then, but I still remember this.
It slowly changed during the N64-PS-area, because the storage problem and therefore the N64 wasn't capable of showing as great video sequences as the PS.
This gen, the problem is that the gen before there where 3 consoles (if you don't count the Dreamcast in) all competing for the best graphics. So then a graphics comparision made sense.
What the reviewers don't seem to get is, that this gen there are 2 consoles fighting over graphics and one fights with a totally different control scheme. So it makes no sense like last gen to compare graphics, because the Wii will always loose. But that's what everybody knows, and the readers want to know, how the game's graphics are compared to what's possible on the console it's on.
As it makes no sense to say that Tiger Woods for PS3/X360 is bad due to the lack of motion controls, it simply makes no sense to judge wii games for graphics the wii are not capable of.
It even becomes more ridiculous if you would include all the handhelds in this standard.