I don't mind minor hacks like putting trees and bushes and things where they normally can't go or whatever, but I'm not a fan of overly hacked towns like putting houses on the beach or creating islands or bridges that overlook the pond area of the river moving the plaza stone or tree around to various locations, etc. I started hacking a couple of my towns yesterday, but I don't plan to go overboard with it just minor hacks like I said with trees and stuff like that. But to each their own.