I've got two significant complaints that made the game much more difficult to recommend than any of the other mainline Animal Crossing game.
The Wii console is a poor fit for any mainline Animal Crossing title, not just for not being an handheld console to begin with.
As the system is only marginally better than GameCube, there's nothing much new the staff could do with the console. The dated visuals of the original Animal Crossing are resulted by porting the original Japanese N64 game, which of course the Wii version easily improved the graphics by essentially adding more polygons and having higher texture resolutions.
There are a few areas where the Wii Remoter's IR pointer becomes useful. However, there's a lot of instances we prefer using another method (or even another controller) rather than the pointer. For some reason, making a pattern will always involve IR pointer for precision drawing, and it tends to be finicky.
Also, if you don't like using WiiSpeak and a USB keyboard, you're pretty much left with awkwardly typing with the Wii Remote with the in-game keyboard. It's fine when you're playing with 4:3 resolution, but going with 16:9 reveals a design flaw: the keys are stretched to fill the TV screen and made typing even slower and more cumbersome. That doesn't matter anymore, since online has been axed since May 2014.
You would be right to assume that the game could still expand a lot upon what Animal Crossing: Wild World did to the original GameCube installment, considering the technical limitations of the Wii system. Too bad City Folk still didn't do much for that matter.
The game didn't necessarily had to reinvent the wheels in order to be a good game. However, it didn't added and improved much to what Wild World did. Sure, there was a number of things that were actually added and improved, but those are pretty much insignificant to the game's overall appeal. For example, the city was lackluster, considering how long it takes to get in and then out and how little there is new content. Some of the stores were already available in form of special visitors or features from the past Animal Crossing titles, only more accessible this time around. Disappointing to see that this only much-touted feature is ultimately insignificant to what Wild World brought to the tables.
So yeah, Animal Crossing: City Folk is the least liked mainline installment for good reasons. While there's still enjoyment to be found there, one can't help but feel it being a lackluster effort that did nothing much to expand the franchise as a whole. You'd have to be hard-pressed to recommend this one over the GameCube installment and New Leaf!