Just to clarify, I haven't played Wild World yet, but I did play the GameCube version and I've read up on Wild World quite a bit recently. Everything I've learned has made me want to go back and try it, so I've asked for it for Christmas and plan on buying it myself if I don't get it as a gift.
I think it depends on what you are interested in. If you are mainly focused on decoration and customization, then there might not be enough to keep you interested in the game. But if you can get past the graphics and want the real experience of connecting to your villagers, I think it's probably worth it. I've really found myself missing the great dialogue from the early games in the series, so for that reason alone, I think Wild World is worth a try.