That's too bad, I'm sorry you're having a bad experience.
I've tried every single game in the franchise but New Leaf is the only I could get into (and it's my favorite game ever now). About your issues:
- Do you run in your town? I'm very impatient so I used to run everywhere and my grass started to look awful. Nowadays I only walk and I don't have any problems with grass wear.
- You're not stuck with your amiibos forever, that's simply not a thing. I'm sorry they're taking so long to move out, but that's purely a coincidence (or bad luck). They move out just like any other villager.
- It seems you're also having bad luck with their requests, because my villagers have always asked for a variety of favors (furniture, fish, fruit, deliveries, etc.).
Maybe you're also having a weird combination of villagers, so if you really dislike your town and villagers you might want to reset and start over. Make sure to have a good combination of personalities (I try to have one villager for each of the eight personalities). I'm sure that way you're going to have a pretty varied experience in New Leaf.