I think the worst parts about online play in Animal Crossing: Wild World was much of what you guys have said.
1. When one person disconnects everybody also disconnects
2. It took way too long to type things on that keyboard
3. Lag
Those are the main things to me but unfortunately the producer of Animal Crossing: City Folk stated that we would still have the same problems with disconnects which is sad but hopefully the Wi-Fi is a lot more stable which I think it will be I don't know how much but it will be improved some.