Denise Kaigler of Nintendo recently wrote a piece discussing the availability of games for the "core" gaming audience and in it she put World of Goo into a group of fairly prestigious games.
... Already we have seen core Nintendo games like The Legend of Zelda: Twilight Princess, Metroid Prime 3, Super Smash Bros. Brawl, Super Mario Galaxy and Mario Kart Wii. And Wii is still less than two years old. Mr. Iwata announced at E3 that the Mario and Zelda teams are working on new games for Wii, and Mr. Miyamoto announced that he's working on a new Pikmin game. Plus our WiiWare service adds interesting new games each week like World of Goo and Mega Man 9.
Additionally, you are seeing core gaming content from key publishers on the Wii platform. Guitar Hero, Rock Band, Call of Duty are great examples....
I'm pretty sure being mentioned in a group of games like Zelda, Mario, Metroid, Pikmin, GH, RB, CoD, Mega Man, etc... is a pretty good thing

Interestingly, I made this comparison of world of goo to other classic games myself in my review a week ago. I'm hesitent to link to it however because I don't really want it to seem like I only came here to give myself a plug =P I just wanted to point out what Nintendo is saying about World of Goo in relationship to some of its best IPs is going well beyond simple praise and is truly remarkable.