As others before me have said, it gets pretty repetitive sometimes, as more than one villager will occasionally want a house with the same kind of theme. It can be fun, as sometimes you'll create something amazing and you'll love it, but a lot of the time I found that I was stuck for ideas with certain themes, so sometimes I'd struggle trying to create something I was happy with, or something that I felt was creative or unique enough.
It can be a fun game to play when you're bored and just kind of want to switch off, but the repetitiveness puts me off sometimes -
it's a good way to get your frustrations out and decorate a villager's house how you'd like to see it decorated though, considering how hard it is to change their houses on New Leaf - that's probably the main reason I bought it in the first place :P