The only thing I don't like about Tapped Out at times is the completion of buildings, if you forget where you've put them on the map they can be very hard to find and you can struggle then to move on with the game, specially if a character is with the building with tasks.
If they would have the building completion work like they do characters tasks it would be spot on, I'm also not keen on the continuous tapping of characters to find round the map to gain whatever items are in the current task, again, it's finding them all and they're often hidden behind buildings which makes it hard to click them too, other than that the game is great.
It would also be very cool if they would release a template of actual Springfield or similar designed maps, only reason because I'm crap at designing the maps and it's way too time consuming, I'd even pay for a template if they had one (as long as it wasn't silly prices) haha