I remember reading a while ago that someone mentioned that some aspects of TS3 look a bit dated. By that I would guess the fashions and hair styles.
TS1 and TS2 would look even more in the past (specially TS1 having that black and white TV!)
What do you see that might look out of date now but does not bother our Sims?
The TVs with the box on the back (remember when people called the TV 'the box')
Yes hair styles. Humara's hairstyle is very 2009!