The real problem with the game (and I'm not even talking about the city processing errors, traffic issues, SIMs traveling to the nearest available house instead of their 'own' house, population inflation, broken zoning, tiny cities, etc) is that the region play - you know, that thing they focused their entire game concept on - is completely broken.
Sims don't travel between cities properly, don't really go to school anywhere else, visitors and tourists just seem to come from invisible places in 'the region', Hell - the chat still does not even seem to work properly.
It's just a terrible state to release a AAA game in. Very, very, very bad.
Yet... I can't stop myself from playing it. I'll be bored of it once everything works though, like everyone else. I guess the thing is, that it's not a bad game, but it misses out on reaching its own potential by such a large margin that you might as well be playing an alpha version.