I would love more cultures to be represented (the whole structure of the Sims based on suburban living feels very American and has nothing to do with my personal experience, though it doesn't prevent me from having fun), but first of all, it's a game, and it needs gameplay. They can't just add an expansion revolving around a certain culture, that's not enough (packs like Island Living or even Snowy Escape feel quite, and gameplay they have is world-restricted, which is not good). That's why packs like farming or generations/family gameplay are important too, they add ways to play and imagine.
My personal problem is, though in many aspects TS4 is more representative than previous games, in one it is very restrictive — worlds. We can't build our own worlds, we can't really change existing ones, therefore we are stuck with mostly American suburbia and sometimes European towns with background buildings and stuff. TS4 is lacking freedom more than representation, imo.