Just because you don't like a style of game on the Nintendo Wii, does not mean it's not a game at all. Cooking Mama, Wii Sports, Wii Play, and Boom Blox are just a couple of games that have opened the gaming demographic and are fun to play.
The Gamecube was graphically more powerful than the PS2, and the games on said console utilised it's graphical prowess, therefore any game that was on the GC on the Wii is automatically better than what it would of been on the PS2.
There are plenty of serious games on the Wii, such as: Super Smash Bros Brawl, Super Paper Mario, Baroque, Nights, Mario Kart Wii, Opoona, Twilight Princess, Metroid, Resident Evil and Sonic Unleashed, which is actually alright. It's just the general gaming media that are slamming the Wii for not having enough serious "core-gamer" games, simply because it's got a lot of third party support with poor quality games.
In regards to Animal Crossing: Let's Go to the City, it's pretty good actually. The style graphically hasn't changed at all, but the graphics are a lot smoother and lot significantly better than the DS and the Gamecube counterpart, the animation is smoother on the Wii than it was on the DS as well.
There's not really much different in terms of gameplay aside from the City side of things, but then what are you really expecting. It's an Animal Crossing game. Similar to how most Harvest Moon games don't change much, AC isn't likely to either. Not until it stops selling anyway.
